What are the reasons for the Honda car indicating an engine emission malfunction?
3 Answers
Honda Guandao engine emission control system failure may be caused by poor gasoline quality leading to three-way catalytic converter poisoning, or damage to the oxygen sensor in the three-way catalytic system. Below is an introduction to the impacts related to engine emission malfunctions: 1. Increased fuel consumption: It will increase fuel consumption, and over time, poor combustion will result in excessive carbon deposits. 2. Service life: It will pose safety hazards while driving and reduce the engine's service life. 3. Increased resistance: During use, the car may experience engine overheating, backfire, and other issues due to faults in the fuel supply system or ignition system, leading to sintering and peeling of the three-way catalytic converter carrier and increased exhaust resistance.
A while ago, my Honda car also had the emission fault light come on. After checking the information, I realized this issue is quite common. The main reasons could be a clogged catalytic converter or a faulty oxygen sensor, as these two components are responsible for purifying exhaust gases and monitoring exhaust composition. Another possibility is that the recent fuel quality was poor, with impurities affecting combustion efficiency. In my case, the fault light flashed after a cold start in winter, and the diagnosis revealed that it was due to aging ignition coils causing incomplete combustion. Regular maintenance, such as cleaning throttle body carbon deposits, is also crucial. Using fuel additives periodically can help prevent this issue. Additionally, spark plugs that haven't been replaced after 50,000 kilometers can easily trigger this problem. In short, it's essential to read the fault codes promptly to address the issue effectively.
Don't panic when the emission fault light comes on, first check if the fuel tank cap is tightened. Common triggers for Honda vehicles include EVAP system leaks, carbon buildup on the front oxygen sensor, or even ECU software false alarms. When repairing cars myself, I've found that many older vehicles have stuck crankcase ventilation valves, allowing unfiltered exhaust gases to enter the intake manifold. If white smoke appears from the exhaust during cold starts, it's likely coolant leaking into the cylinders. Pay special attention to vehicles used mainly for short trips—if the exhaust pipe doesn't heat up sufficiently, moisture can't evaporate, potentially accelerating sensor corrosion. Using an OBD scanner to read specific trouble codes is the safest approach; codes like P0171/P0420 directly correspond to different components.
