Is the Exhaust Monitoring System Warning Light Serious?

1 Answers
KimberlyDella
07/29/25 2:14pm
The exhaust monitoring system warning light is not serious. Here is some relevant information about the exhaust monitoring system warning light: Concept: The exhaust monitoring light indicates poor engine performance and non-compliant exhaust emissions. The ECU (Engine Control Unit) generally has a self-diagnosis and protection function. When a system fault occurs, it automatically records the fault code in RAM and implements protective measures by reading substitute programs from the inherent program to maintain engine operation. Causes: Issues such as faulty spark plugs, ignition coil failure, fuel pump malfunction, or clogged fuel lines can lead to poor combustion of the air-fuel mixture in the engine. Poor combustion results in engine carbon buildup or knocking problems, which are ultimately detected by the engine's oxygen sensors. After being reported to the ECU, the fault light will naturally illuminate as a warning.
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