Is it normal for the engine fault light to come on in a new car?
2 Answers
It is not normal for the engine fault light to come on in a new car. Here are the reasons: Faulty fuel emission system: The vehicle fault light usually indicates a problem with the fuel emission system. When the fault light is on, start and turn off the vehicle three times, then observe whether the fault light remains illuminated. Damaged catalytic converter or oxygen sensor fault: If the signals from the front and rear oxygen sensors are consistent, it indicates a damaged catalytic converter or an oxygen sensor issue. When the oxygen sensor is damaged, the computer cannot determine the exhaust composition, causing the system to enter emergency mode. Unqualified exhaust: Unqualified exhaust can trigger the engine fault light. Ignition system problems: In the ignition system, issues such as large spark plug gaps, damaged ignition coils, damaged injectors, carbon buildup, or leaks and blockages in the intake system pipes can cause the fault light to come on.
As an experienced driver, it's crucial to take the sudden illumination of the engine warning light seriously, especially if it happens shortly after purchasing a new car, as this is highly unusual. This indicates that the engine control system has detected abnormal signals, such as an oxygen sensor malfunction or emission issues. Failing to address it promptly could impair engine performance or even lead to a breakdown and accidents on the road. Although new cars have a break-in period, the warning light is no trivial matter; my biggest concern is its impact on safety. Therefore, I recommend immediately contacting a 4S dealership or professional repair shop for diagnostic checks—avoid attempting DIY fixes to prevent prolonging the issue. During regular maintenance, having the technician scan for trouble codes can help prevent such incidents, ensuring a safe and reliable driving experience.
