7 MOST Common OBD DTCs for Toyota Harrier

Diagnosing and fixing a problem with your Toyota Harrier can be frustrating, especially when the check engine light comes on. The On-Board Diagnostic (OBD) system helps identify the root cause of the issue, and the diagnostic trouble codes (DTCs) are the key. In this article, we’ll discuss the 7 most common OBD DTCs for Toyota Harrier, including P0171, P0500, P1135, P1150, P0141, P0110, and P1130. Understanding these codes can help you get a better idea of what’s wrong with your vehicle and how to fix it.

Toyota Harrier DTC P0171

Parts #:

Description:

The code P0171 is a generic OBD-II code which indicates that the engine control module (ECM) has detected a lean condition on bank 1 of the engine. This means that the air/fuel mixture is too lean, meaning there is not enough fuel and too much air in the mixture. This can cause the engine to run poorly and potentially cause damage to the catalytic converter and other engine components.

Symptoms:

The symptoms of a P0171 code in a Toyota Harrier may include:

Engine performance issues such as reduced power, hesitation, or stalling
Poor fuel efficiency
A decrease in engine power
Engine misfire
A decrease in engine speed
Engine light illumination
Poor acceleration
Engine noise

Cause:

There are several reasons why the code P0171 may be stored in a Toyota Harrier including:

A vacuum leak
A clogged air filter
A faulty mass air flow sensor
A leak in the intake manifold
A malfunctioning fuel injector
A faulty oxygen sensor
A malfunctioning fuel pressure regulator
A vacuum hose that is disconnected or damaged

Possible Location:

The following parts are commonly associated with the code P0171 in a Toyota Harrier:

Vacuum hoses
Air filter
Mass air flow sensor
Intake manifold
Fuel injectors
Oxygen sensor
Fuel pressure regulator

Howto Fix the Problem:

To fix the problem causing the code P0171 in a Toyota Harrier, the following steps should be taken:

Locate and repair any vacuum leaks
Replace a clogged air filter
Replace a faulty mass air flow sensor
Repair any leaks in the intake manifold
Replace a faulty fuel injector
Replace a faulty oxygen sensor
Replace a malfunctioning fuel pressure regulator
Repair or replace any vacuum hoses that are disconnected or damaged

How Difficult to Fix:

The difficulty of fixing the code P0171 in a Toyota Harrier will depend on the underlying cause. Some of the repairs, such as replacing an air filter or vacuum hose, may be relatively simple and straightforward. However, if the problem is caused by a faulty sensor or component, the repair may be more complex and require specialized tools and knowledge. It is recommended to have the vehicle diagnosed by a professional mechanic to determine the exact cause of the code and recommend the most appropriate repair solution.

Can You Drive With This Code:

It is not recommended to drive a vehicle with the code P0171 as it may cause further damage to the engine and decrease the performance and efficiency of the vehicle. It is best to have the vehicle inspected and repaired as soon as possible.

How to Clear the Code:

The code P0171 can be cleared by disconnecting the battery, which will reset the relearn of the engine control unit (ECU). It is important to note that this will not fix the underlying issue causing the code to be stored and it will likely reappear if the problem is not addressed and repaired. It is recommended to have the vehicle inspected and repaired by a professional mechanic to ensure the issue is resolved and the code is permanently cleared.

Tools Need to use:

The tools needed to diagnose and repair the code P0171 in a Toyota Harrier may include:

OBD-II scanner
Vacuum gauge
Multimeter
Fuel pressure gauge
Scan tool for live data streaming and freeze frame analysis

These tools are needed to diagnose and repair the code as they can provide valuable information about the engine’s performance and help identify the root cause of the problem.

Step-by-Step Diagnostic Procedure:

The following is a step-by-step diagnostic procedure for the code P0171 in a Toyota Harrier:

Retrieve the freeze frame data and note the conditions under which the code was stored. This information can be helpful in determining the cause of the code.
Inspect the air intake system for any signs of damage, leaks, or loose connections. Check the air filter and replace if necessary.
Check all vacuum hoses for proper connections, damage, or leaks. Repair or replace any damaged hoses as necessary.
Check the mass air flow sensor for signs of damage or contamination. Clean or replace the sensor if necessary.
Check the fuel injectors for proper operation and replace any injectors that are not working properly.
Check the fuel pressure using a fuel pressure gauge. Replace the fuel pressure regulator if the pressure is not within the specified range.
Check the oxygen sensor for proper operation and replace if necessary.
Check the engine compression and perform a cylinder balance test to determine if the engine is mechanically sound.
After all repairs have been made, clear the code and test drive the vehicle to verify that the code does not reappear and the engine is running smoothly.

Toyota Harrier DTC P0500

Description:

The code P0500 is a generic OBD-II code that is triggered when the engine control module (ECM) detects a fault with the vehicle speed sensor circuit. The vehicle speed sensor (VSS) is used to monitor the speed of the vehicle and provide this information to the ECM for proper engine management and transmission shifting. A faulty VSS or VSS circuit can cause a variety of issues including incorrect speedometer readings, transmission shifting problems, and reduced engine performance.

Symptoms:

The symptoms of a P0500 code can include:

Incorrect speedometer readings
Transmission shifting problems
Reduced engine performance
Lack of power or acceleration
Stalling or hesitating at high speeds

Cause:

The code P0500 can be caused by a variety of issues including:

Faulty vehicle speed sensor
Faulty speed sensor circuit
Wiring issues in the speed sensor circuit
Damage or corrosion to the speed sensor connector
Issues with the transmission or its control module

Possible Location:

The vehicle speed sensor is typically located on the transmission, differential, or the driveshaft. The exact location may vary depending on the make and model of the vehicle.

How to Fix the Problem:

To fix the problem causing the code P0500 in a Toyota Harrier, the following steps should be taken:

Inspect the wiring and connections in the speed sensor circuit for damage or corrosion
Replace the vehicle speed sensor if it is found to be faulty
Repair any issues in the speed sensor circuit such as damaged wiring or connections
Inspect the transmission and its control module for any faults or issues that may be causing the problem

How Difficult to Fix:

The difficulty of fixing the code P0500 in a Toyota Harrier can vary depending on the cause of the issue. In some cases, it may be a simple fix such as replacing a faulty speed sensor, while in other cases it may require more extensive repairs such as repairing damaged wiring in the speed sensor circuit or replacing the transmission. It is recommended to seek the help of a professional mechanic to accurately diagnose and repair the code P0500 in a Toyota Harrier.

Can You Drive With This Code:

It is not recommended to drive a vehicle with the code P0500 as it can cause a variety of issues including incorrect speedometer readings, transmission shifting problems, and reduced engine performance. Driving a vehicle with a P0500 code can also potentially cause further damage to the vehicle, so it is recommended to have the issue repaired as soon as possible.

How to Clear the Code:

The code P0500 can be cleared by disconnecting the battery, which will reset the relearn of the ECU. However, it is important to note that simply clearing the code will not fix the underlying problem causing the code to be stored. The code will reappear if the problem is not repaired, so it is important to have the issue diagnosed and repaired as soon as possible.

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Tools Needed to Use:

The following tools may be needed to diagnose and repair the code P0500 in a Toyota Harrier:

OBD-II scanner
Multimeter
Fuel pressure gauge
Vehicle-specific repair manual
Hand tools such as pliers and wrenches

Step-by-Step Diagnostic Procedure:

The following is a step-by-step diagnostic procedure for the code P0500 in a Toyota Harrier:

Retrieve the freeze frame data and note the conditions under which the code was stored. This information can be helpful in determining the cause of the code.
Inspect the wiring and connections in the speed sensor circuit for any signs of damage, corrosion, or loose connections.
Check the vehicle speed sensor for proper operation and replace if necessary.
Check the speed sensor circuit for any open or shorted wires, and repair or replace as necessary.
Check the transmission and its control module for any issues that may be causing the code P0500. This may include issues with the transmission control module, solenoids, or internal transmission components.
If all previous steps have been completed and the code P0500 is still present, perform a road test of the vehicle to confirm the issue and gather additional data.
Using the information gathered from the previous steps, accurately diagnose the cause of the code P0500 and repair as necessary.
Clear the code and retest the vehicle to confirm that the issue has been resolved.

Toyota Harrier DTC P1135

Parts #:

Description:

DTC P1135 refers to the malfunction of the Air-Fuel Ratio (A/F) Sensor Heater Circuit for Bank 1, Sensor 1. This code indicates that the Engine Control Module (ECM) has detected a problem with the heater element inside the A/F sensor.

Symptoms:

Check engine light is on
Poor fuel economy
Poor engine performance
Engine hesitation or stalling

Cause:

Possible causes of this issue include:

Failed A/F sensor heater
Open or short in A/F sensor heater circuit
Corroded or damaged wiring/connectors
Malfunctioning ECM

Possible Location:

The A/F sensor is typically located in the exhaust manifold or front exhaust pipe of Bank 1, Sensor 1.

How to Fix the Problem:

1. Inspect the wiring and connectors associated with the A/F sensor heater circuit.
2. Check the resistance of the A/F sensor heater.
3. If the heater circuit is open or shorted, replace the A/F sensor.
4. If the wiring and connectors are in good condition, and the A/F sensor heater resistance is within specifications, inspect the ECM for faults.

How Difficult to Fix:

Fixing this issue can be moderately difficult and may require basic to intermediate automotive repair knowledge and tools.

Can You Drive With This Code:

You can still drive with this code; however, it may lead to poor engine performance, increased fuel consumption, and potential damage to the catalytic converter.

How to Clear the Code:

You can clear the code by using an OBD-II scanner or by disconnecting the battery. However, disconnecting the battery may reset the ECM’s learned data and require the vehicle to relearn certain parameters.

Tools Needed to Use:

The tools needed for diagnosing and fixing this issue include:

OBD-II scanner: To read and clear the DTC codes
Multimeter: To measure the resistance of the A/F sensor heater and check for voltage in the wiring
Basic hand tools: For removing and installing the A/F sensor or checking connectors and wiring

The purpose of these tools is to help you diagnose the problem accurately, verify the integrity of the A/F sensor heater circuit, and replace the faulty components as needed.

Step-by-Step Diagnostic Procedure:

Follow these steps to diagnose and fix the DTC P1135 issue:
Read the DTC code: Use an OBD-II scanner to read the code from the ECM. Note any other codes that may be related to the issue.

Inspect the wiring and connectors: Visually inspect the wiring and connectors associated with the A/F sensor heater circuit. Look for any signs of damage, corrosion, or loose connections.

Check the A/F sensor heater resistance: Using a multimeter, measure the resistance of the A/F sensor heater. Refer to the manufacturer’s specifications for the acceptable resistance range.

Replace the A/F sensor (if necessary): If the heater circuit is found to be open or shorted, replace the A/F sensor with a new one.

Inspect the ECM (if necessary): If the wiring and connectors are in good condition, and the A/F sensor heater resistance is within specifications, inspect the ECM for any faults.

Clear the DTC code: Once the issue has been resolved, use the OBD-II scanner to clear the code.

Perform a test drive: Drive the vehicle to ensure the issue has been resolved and the check engine light does not return.

Preventive Maintenance:

To prevent the DTC P1135 issue from reoccurring in the future, consider the following preventive maintenance tips:
Regularly inspect wiring and connectors: Regularly check the wiring and connectors associated with the A/F sensor heater circuit for any signs of damage or wear. This can help you identify and fix any potential issues before they become more severe.

Keep your vehicle well-maintained: Ensuring that your vehicle is serviced according to the manufacturer’s recommended maintenance schedule can help prevent various engine and exhaust system issues, including those related to the A/F sensor.

Use quality replacement parts: When replacing the A/F sensor or other components, always use high-quality parts from reputable manufacturers. This can help ensure the longevity and proper functioning of the new components.

Regularly monitor vehicle performance: Keep an eye on your vehicle’s performance and fuel economy. If you notice any sudden changes or deterioration, it could be an early sign of a problem with the A/F sensor or other components.

Address check engine lights promptly: If the check engine light comes on, address the issue as soon as possible. Ignoring the warning can lead to more severe problems or damage to other components, such as the catalytic converter.

Toyota Harrier DTC P1150

Parts #:

Description:

DTC P1150 refers to the malfunction of the Air-Fuel Ratio (A/F) Sensor Circuit Range/Performance for Bank 2, Sensor 1. This code indicates that the Engine Control Module (ECM) has detected an issue with the A/F sensor’s output voltage or response time.

Symptoms:

Check engine light is on
Poor fuel economy
Poor engine performance
Engine hesitation or stalling

Cause:

Possible causes of this issue include:

Failed A/F sensor
Contaminated or damaged A/F sensor
Open or short in A/F sensor circuit
Corroded or damaged wiring/connectors
Malfunctioning ECM

Possible Location:

The A/F sensor is typically located in the exhaust manifold or front exhaust pipe of Bank 2, Sensor 1.

How to Fix the Problem:

1. Inspect the wiring and connectors associated with the A/F sensor circuit.
2. Check the output voltage of the A/F sensor using a scan tool or multimeter.
3. If the output voltage or response time is out of specification, replace the A/F sensor.
4. If the wiring and connectors are in good condition, and the A/F sensor output voltage is within specifications, inspect the ECM for faults.

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How Difficult to Fix:

Fixing this issue can be moderately difficult and may require basic to intermediate automotive repair knowledge and tools.

Can You Drive With This Code:

You can still drive with this code; however, it may lead to poor engine performance, increased fuel consumption, and potential damage to the catalytic converter.

How to Clear the Code:

You can clear the code by using an OBD-II scanner or by disconnecting the battery. However, disconnecting the battery may reset the ECM’s learned dataand require a relearn process. It is recommended to use an OBD-II scanner to clear the code after fixing the issue.

Tools Needed to Use:

The tools needed for diagnosing and fixing this issue include:

OBD-II scanner: To read and clear the DTC codes
Multimeter: To measure the A/F sensor output voltage and check for voltage in the wiring
Basic hand tools: For removing and installing the A/F sensor or checking connectors and wiring

The purpose of these tools is to help you diagnose the problem accurately, verify the integrity of the A/F sensor circuit, and replace the faulty components as needed.

Step-by-Step Diagnostic Procedure:

Follow these steps to diagnose and fix the DTC P1150 issue:
Read the DTC code: Use an OBD-II scanner to read the code from the ECM. Note any other codes that may be related to the issue.

Inspect the wiring and connectors: Visually inspect the wiring and connectors associated with the A/F sensor circuit. Look for any signs of damage, corrosion, or loose connections.

Check the A/F sensor output voltage: Using a multimeter or scan tool, measure the output voltage of the A/F sensor. Refer to the manufacturer’s specifications for the acceptable voltage range.

Replace the A/F sensor (if necessary): If the output voltage or response time is out of specification, replace the A/F sensor with a new one.

Inspect the ECM (if necessary): If the wiring and connectors are in good condition, and the A/F sensor output voltage is within specifications, inspect the ECM for any faults.

Clear the DTC code: Once the issue has been resolved, use the OBD-II scanner to clear the code.

Perform a test drive: Drive the vehicle to ensure the issue has been resolved and the check engine light does not return.

Toyota Harrier DTC P0141

Parts : Bank 1 Sensor 2 Oxygen Sensor (O2 Sensor)

Description:

DTC P0141 refers to a malfunction in the Bank 1 Sensor 2 Oxygen Sensor (O2 Sensor). The code is triggered when the Engine Control Module (ECM) detects insufficient activity from the sensor, indicating that it is not properly measuring the amount of oxygen in the exhaust.

Symptoms:

Check engine light is on
Poor fuel economy
Rough idle
Decreased engine performance
Failed emissions test

Cause:

Faulty Bank 1 Sensor 2 O2 Sensor
Wiring or electrical problems
Exhaust leaks
Contaminated or damaged sensor

Possible Location:

The Bank 1 Sensor 2 O2 Sensor is located in the exhaust system after the catalytic converter.

How to Fix the Problem:

Inspect and replace the faulty O2 sensor
Check for wiring and electrical problems
Inspect for exhaust leaks and repair if necessary
Clean or replace the sensor if contaminated or damaged

How Difficult to Fix:

Replacing an O2 sensor is generally a straightforward task for a DIYer with basic automotive knowledge and tools.

Can You Drive With This Code:

While it is possible to drive with a P0141 code, it is not recommended. It can lead to decreased fuel efficiency, increased emissions, and potential damage to the catalytic converter.

How to Clear the Code:

After addressing the issue, you can clear the code using an OBD2 scanner. Disconnecting the battery may reset the ECM, but it is not recommended as it may erase other important data and settings.

Tools Needed to Use:

OBD2 scanner: to read and clear the DTC P0141 code and monitor sensor readings
Wrench or ratchet set: for removing and installing the oxygen sensor
Wire brush or sandpaper: to clean the sensor contacts (if applicable)
Voltmeter or multimeter: for checking wiring issues and sensor functionality
Jack and jack stands: for lifting the vehicle to access the oxygen sensor

Step-by-Step Diagnostic Procedure:

Use an OBD2 scanner to confirm the presence of DTC P0141 and gather any additional information on the issue.
Ensure the vehicle is turned off and parked on a level surface. Raise the vehicle using a jack and support it with jack stands for safety.
Locate the Bank 1 Sensor 2 oxygen sensor in the exhaust system after the catalytic converter.
Visually inspect the oxygen sensor and wiring for any obvious signs of damage, corrosion, or disconnection. Repair or replace as necessary.
Check for any exhaust leaks near the oxygen sensor that may affect its performance. Repair leaks as needed.
Using a voltmeter or multimeter, test the oxygen sensor’s voltage output to determine if it is functioning correctly. Compare the readings to the manufacturer’s specifications.
If the oxygen sensor is found to be faulty, remove it using a wrench or ratchet set and replace it with a new one.
Lower the vehicle and start the engine to check if the issue has been resolved. Use the OBD2 scanner to clear the DTC P0141 code and monitor sensor readings.
If the issue persists, further diagnosis may be required to identify any underlying problems with the vehicle’s fuel or ignition system.

Additional Troubleshooting Tips:

If the issue still persists after following the above diagnostic procedure, consider the following additional troubleshooting tips:

Check the integrity of the engine control module (ECM) and its connections. Inspect for loose or corroded connectors that could cause intermittent issues with the oxygen sensor readings.
Inspect the entire wiring harness related to the oxygen sensor circuit for signs of wear, damage, or chafing. Repair or replace the wiring as necessary.
Verify that the engine coolant temperature (ECT) sensor and mass air flow (MAF) sensor are functioning correctly. These sensors can affect the oxygen sensor’s performance and cause a P0141 code if they are not functioning properly.
Examine the condition of the catalytic converter. A damaged or clogged catalytic converter can cause poor oxygen sensor performance and trigger a P0141 code.
Consult a professional mechanic or the vehicle’s service manual for more advanced diagnostic procedures if the problem persists. Some issues may require specialized tools, equipment, or knowledge beyond the scope of a DIY repair.

Toyota Harrier DTC P0110

Parts : Intake Air Temperature (IAT) Sensor

Description:

DTC P0110 refers to a malfunction in the Intake Air Temperature (IAT) sensor circuit. The code is triggered when the Engine Control Module (ECM) detects an out-of-range or erratic signal from the IAT sensor, which measures the temperature of the air entering the engine.

Symptoms:

Check engine light is on
Poor fuel economy
Rough idle
Decreased engine performance
Difficulty starting in cold weather

Cause:

Faulty IAT sensor
Wiring or electrical problems in the IAT sensor circuit
Corroded or damaged sensor connector
Contaminated or damaged sensor

Possible Location:

The IAT sensor is typically located in the air intake duct or integrated into the Mass Air Flow (MAF) sensor.

How to Fix the Problem:

Inspect and replace the faulty IAT sensor
Check for wiring and electrical problems in the IAT sensor circuit
Inspect the sensor connector for corrosion or damage and repair as necessary
Clean or replace the sensor if contaminated or damaged

How Difficult to Fix:

Replacing an IAT sensor is generally a simple task for a DIYer with basic automotive knowledge and tools.

Can You Drive With This Code:

While it is possible to drive with a P0110 code, it is not recommended. It can lead to decreased fuel efficiency, increased emissions, and poor engine performance.

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How to Clear the Code:

After addressing the issue, you can clear the code using an OBD2 scanner. Disconnecting the battery may reset the ECM, but it is not recommended as it may erase other important data and settings.

Tools Needed to Use:

OBD2 scanner: to read and clear the DTC P0110 code
Screwdriver or pliers: for removing the IAT sensor (if applicable)
Electrical contact cleaner: for cleaning the IAT sensor connector (if necessary)
Voltmeter or multimeter: for checking wiring issues and sensor functionality

Step-by-Step Diagnostic Procedure:

Use an OBD2 scanner to confirm the presence of DTC P0110 and gather any additional information on the issue.
Locate the IAT sensor in the air intake duct or integrated into the MAF sensor.
Visually inspect the IAT sensor and wiring for any obvious signs of damage, corrosion, or disconnection. Repair or replace as necessary.
Using a voltmeter or multimeter, test the IAT sensor’s resistance and compare it to the manufacturer’s specifications. Replace the sensor if it is out of range.
Inspect the sensor connector for signs of corrosion or damage. Clean the connector with electrical contact cleaner if necessary.
Check for any wiring issues in the IAT sensor circuit and repair as needed.
After fixing the issue, use the OBD2 scanner to clear the DTC P0110 code and monitor the IAT sensor readings to ensure the problem is resolved.

By following the step-by-step diagnostic procedure, you can effectively diagnose and resolve a P0110 code on your Toyota Harrier. Remember to always use caution and work safely when working on your vehicle. If you’re unsure about any part of the repair process, consult a professional mechanic for assistance.

Additional Troubleshooting Tips:

If the issue still persists after following the above diagnostic procedure, consider the following additional troubleshooting tips:

Check the integrity of the Engine Control Module (ECM) and its connections. Inspect for loose or corroded connectors that could cause intermittent issues with the IAT sensor readings.
Inspect the entire wiring harness related to the IAT sensor circuit for signs of wear, damage, or chafing. Repair or replace the wiring as necessary.
Verify that other sensors, such as the Mass Air Flow (MAF) sensor or the Throttle Position (TP) sensor, are functioning correctly. These sensors can affect the IAT sensor’s performance and cause a P0110 code if they are not functioning properly.
Consult a professional mechanic or the vehicle’s service manual for more advanced diagnostic procedures if the problem persists. Some issues may require specialized tools, equipment, or knowledge beyond the scope of a DIY repair.

Toyota Harrier DTC P1130

Parts: Air/Fuel Ratio (A/F) Sensor – Bank 1 Sensor 1

Description:

DTC P1130 indicates a malfunction in the Air/Fuel Ratio (A/F) sensor circuit for Bank 1 Sensor 1. This code is triggered when the Engine Control Module (ECM) detects an incorrect voltage output or an issue with the sensor’s heater circuit.

Symptoms:

Check engine light is on
Poor fuel economy
Rough idle
Decreased engine performance
Increased emissions

Cause:

Faulty A/F sensor
Wiring or electrical problems in the A/F sensor circuit
Corroded or damaged sensor connector
Exhaust leaks near the sensor

Possible Location:

The A/F sensor Bank 1 Sensor 1 is typically located on the exhaust manifold or exhaust pipe, upstream of the catalytic converter.

How to Fix the Problem:

Inspect and replace the faulty A/F sensor
Check for wiring and electrical problems in the A/F sensor circuit
Inspect the sensor connector for corrosion or damage and repair as necessary
Check for exhaust leaks near the sensor and repair if necessary

How Difficult to Fix:

Replacing an A/F sensor is generally a moderately difficult task for a DIYer with basic automotive knowledge and tools. However, diagnosing and repairing wiring or exhaust issues may be more challenging and may require professional assistance.

Can You Drive With This Code:

Driving with a P1130 code is not recommended, as it can lead to decreased fuel efficiency, increased emissions, and poor engine performance. It is best to address the issue as soon as possible.

How to Clear the Code:

After addressing the issue, you can clear the code using an OBD2 scanner. Disconnecting the battery may reset the ECM, but it is not recommended as it may also clear other learned settings and may not always clear the code effectively. If the underlying issue has been properly fixed, the code should not reappear after clearing it with the OBD2 scanner.

Tools Needed to Use:

OBD2 scanner: to read and clear the DTC P1130 code
Wrench or socket set: for removing and installing the A/F sensor
Electrical contact cleaner: for cleaning the A/F sensor connector (if necessary)
Voltmeter or multimeter: for checking wiring issues and sensor functionality
Exhaust leak detection tools (optional): for checking for exhaust leaks near the sensor

Step-by-Step Diagnostic Procedure:

Use an OBD2 scanner to confirm the presence of DTC P1130 and gather any additional information on the issue.
Locate the A/F sensor Bank 1 Sensor 1 in the exhaust manifold or exhaust pipe.
Visually inspect the A/F sensor and wiring for any obvious signs of damage, corrosion, or disconnection. Repair or replace as necessary.
Check for exhaust leaks near the sensor, as they can cause incorrect readings. Repair any leaks found.
Using a voltmeter or multimeter, test the A/F sensor’s resistance and compare it to the manufacturer’s specifications. Replace the sensor if it is out of range.
Inspect the sensor connector for signs of corrosion or damage. Clean the connector with electrical contact cleaner if necessary.
Check for any wiring issues in the A/F sensor circuit and repair as needed.
After fixing the issue, use the OBD2 scanner to clear the DTC P1130 code and monitor the A/F sensor readings to ensure the problem is resolved.

By following the step-by-step diagnostic procedure, you can effectively diagnose and resolve a P1130 code on your Toyota Harrier. Remember to always use caution and work safely when working on your vehicle. If you’re unsure about any part of the repair process, consult a professional mechanic for assistance.

It is essential to maintain a regular maintenance schedule for your Toyota Harrier, as this can help prevent issues like DTC P1130 from occurring in the future. Here are some additional tips to keep your vehicle running smoothly and efficiently:

Preventive Maintenance Tips:

Regularly inspect and replace air and fuel filters: Dirty or clogged filters can lead to poor engine performance and increased emissions.
Check for exhaust leaks: Regularly inspect the exhaust system for leaks, as they can cause incorrect A/F sensor readings and lead to poor engine performance.
Perform regular oil changes: Changing your engine oil and filter regularly helps ensure the longevity of your engine and its components, including the A/F sensors.
Inspect spark plugs and ignition system: A well-maintained ignition system ensures efficient combustion, reducing the chances of engine misfires and poor A/F sensor readings.
Use quality fuel: Poor-quality fuel can lead to deposits in the combustion chamber, affecting the performance of the A/F sensors and other engine components.
Monitor your OBD2 system: Regularly scanning your vehicle’s OBD2 system can help detect potential issues early, preventing more severe problems and expensive repairs.

By following these preventive maintenance tips and addressing any issues that arise promptly, you can help ensure that your Toyota Harrier continues to operate efficiently and with minimal problems. Remember that while some repairs can be performed by a DIYer with basic automotive knowledge, more complex issues may require the assistance of a professional mechanic. Always use caution and work safely when working on your vehicle.

WORDS FROM ERWIN SALARDA
It’s important to note that these are just the 7 most common OBD DTCs for Toyota Harrier and there could be other codes that aren’t listed here. If you’re experiencing any issues with your vehicle, it’s best to take it to a professional mechanic for a proper diagnosis. Regular maintenance and check-ups can also help prevent these issues from arising in the first place. Stay informed and stay ahead of potential problems with your Toyota Harrier by knowing the most common OBD DTCs.