TOP 10 Most Common DTC Problems Found in Honda City Cars
If you own a Honda City, you should be aware of the most common DTC (diagnostic trouble code) issues. Misfires, catalytic converter inefficiency, O2 sensor malfunctions, and cylinder misfires are just a few examples. Understanding the symptoms and causes of these problems allows you to take preventative measures and quickly address any problems that do arise. In this article, we will provide an overview of the 10 most common DTC problems found in Honda City vehicles, as well as descriptions of their symptoms and causes, to assist you in keeping your vehicle running smoothly.
TOP 10 DTC
DTC P0300 – Random/Multiple Cylinder Misfire Detected:
Description: This DTC indicates that the engine control module (ECM) has detected misfires in multiple cylinders, but it cannot identify a specific cylinder causing the misfires.
Cause: The cause of this DTC can be due to a variety of factors such as faulty ignition system components, clogged fuel injectors, low fuel pressure, vacuum leaks, or a malfunctioning ECM.
Symptoms: Symptoms of this DTC include rough idle, engine hesitation or stumbling, reduced engine power, and potentially increased fuel consumption or emissions. The Check Engine Light may also be illuminated.
Location of Fault: The location of the fault can be in any of the cylinders, but the ECM cannot identify a specific cylinder.
DTC P0420 – Catalyst System Efficiency Below Threshold:
Description: This DTC indicates that the ECM has detected that the catalytic converter is not performing up to its efficiency level, as measured by the rear O2 sensor’s output.
Cause: The cause of this DTC can be due to a variety of factors such as a faulty catalytic converter, a malfunctioning rear O2 sensor, an exhaust leak, or a fuel system issue.
Symptoms: Symptoms of this DTC can include reduced engine power, reduced fuel economy, and potentially increased emissions. The Check Engine Light may also be illuminated.
Location of Fault: The location of the fault is in the catalytic converter or the rear O2 sensor.
DTC P0135 – O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1):
Description: This DTC indicates that the ECM has detected a malfunction in the O2 sensor heater circuit for the bank 1 sensor 1.
Cause: The cause of this DTC can be due to a faulty O2 sensor heater element, a blown fuse, or a wiring issue.
Symptoms: Symptoms of this DTC can include reduced fuel economy, increased emissions, and potentially reduced engine power. The Check Engine Light may also be illuminated.
Location of Fault: The location of fault is in the O2 sensor heater circuit for bank 1 sensor 1, which is located in the exhaust system.
DTC P0301 – Cylinder 1 Misfire Detected:
Description: This DTC indicates that the ECM has detected a misfire in cylinder 1.
Cause: The cause of this DTC can be due to a variety of factors such as a faulty spark plug, ignition coil, fuel injector, or a compression issue in cylinder 1.
Symptoms: Symptoms of this DTC can include rough idle, engine hesitation or stumbling reduced engine power, and potentially increased fuel consumption or emissions. The Check Engine Light may also be illuminated.
Location of Fault: The location of the fault is in cylinder 1.
DTC P0302 – Cylinder 2 Misfire Detected:
Description: This DTC indicates that the ECM has detected a misfire in cylinder 2.
Cause: The cause of this DTC can be due to a variety of factors such as a faulty spark plug, ignition coil, fuel injector, or a compression issue in cylinder 2.
Symptoms: Symptoms of this DTC can include rough idle, engine hesitation or stumbling reduced engine power, and potentially increased fuel consumption or emissions. The Check Engine Light may also be illuminated.
Location of Fault: The location of the fault is in cylinder 2.
DTC P0303 – Cylinder 3 Misfire Detected:
Description: This DTC indicates that the ECM has detected a misfire in cylinder 3.
Cause: The cause of this DTC can be due to a variety of factors such as a faulty spark plug, ignition coil, fuel injector, or a compression issue in cylinder 3.
Symptoms: Symptoms of this DTC can include rough idle, engine hesitation or stumbling reduced engine power, and potentially increased fuel consumption or emissions. The Check Engine Light may also be illuminated.
Location of Fault: The location of the fault is in cylinder 3.
DTC P0304 – Cylinder 4 Misfire Detected:
Description: This DTC indicates that the ECM has detected a misfire in cylinder 4.
Cause: The cause of this DTC can be due to a variety of factors such as a faulty spark plug, ignition coil, fuel injector, or a compression issue in cylinder 4.
Symptoms: Symptoms of this DTC can include rough idle, engine hesitation or stumbling reduced engine power, and potentially increased fuel consumption or emissions. The Check Engine Light may also be illuminated.
Location of Fault: The location of the fault is in cylinder 4.
DTC P0137 – O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2):
Description: This DTC indicates that the ECM has detected a low voltage signal from the O2 sensor in bank 1 sensor 2.
Cause: The cause of this DTC can be due to a faulty O2 sensor, a wiring issue, or a malfunctioning ECM.
Symptoms: Symptoms of this DTC can include reduced fuel economy, increased emissions, and potentially reduced engine power. The Check Engine Light may also be illuminated.
Location of Fault: The location of fault is in the O2 sensor circuit for bank 1 sensor 2, which is located downstream of the catalytic converter.
DTC P0171 – System Too Lean (Bank 1):
Description: This DTC indicates that the ECM has detected that the fuel system is delivering too little fuel to maintain a proper air/fuel ratio on bank 1.
Cause: The cause of this DTC can be due to a variety of factors such as a clogged fuel filter, a faulty fuel pump, a vacuum leak, or a malfunctioning O2 sensor.
Symptoms: Symptoms of this DTC can include rough idle, engine hesitation or stumbling reduced engine power, and potentially increased fuel consumption or emissions. The Check Engine Light may also be illuminated.
Location of Fault: The location of fault is in the fuel system on bank 1.
DTC P0420 – Catalyst System Efficiency Below Threshold (Bank 1):
Description: This DTC is similar to P0420 above, but specifies that the inefficiency is on bank 1 of the engine.
Cause: The cause of this DTC can be due to a variety of factors such as a faulty catalytic converter, a malfunctioning rear O2 sensor, an exhaust leak, or a fuel system issue.
Symptoms: Symptoms of this DTC can include reduced engine power, reduced fuel economy, and potentially increased emissions. The Check Engine Light may also be illuminated.
Location of Fault: The location of the fault is in the catalytic converter or the rear O2 sensor on bank 1 of the engine.
WORDS FROM ME!
Knowing the most common DTC problems in Honda City vehicles is critical for maintaining your vehicle’s performance and reliability. You can help prevent more serious problems from occurring and avoid costly repairs down the road by staying proactive and addressing any issues as soon as they arise. If you are unsure how to diagnose or repair any DTC issues, it is always best to seek the advice of a qualified mechanic who can offer expert advice and ensure that your vehicle remains in top condition.