What does it mean when the engine exhaust fault light is on?

[VanZoe]

Engine exhaust fault light is on for the following reasons: Fuel pump failure: If the fault light comes on and the vehicle cannot start after stalling, this is usually due to a fuel pump or ignition system failure. It requires replacement of new fuel pump, ignition coils, spark plugs, and other components. Continuing to drive may cause severe shaking, lack of acceleration, and other symptoms. Addressing this promptly not only prevents further engine damage but also ensures the safety of the driver and passengers. Excessive carbon buildup: The engine exhaust system fault light may illuminate due to excessive carbon deposits in the throttle body or inside the engine, causing an imbalance in the air-fuel mixture. When the engine control unit detects signals affecting emission requirements, the fault light will activate. The vehicle then requires carbon cleaning or throttle body replacement.