What is the reason for the failure light of Buick LaCrosse engine?

Because the vehicle exhaust gas is not up to standard, the fault indicator light is on. Cause of Buick engine fault light: 1, exhaust emission is not up to standard. For example, poor fuel, three-way catalyst failure, excessive carbon deposition in the intake pipe, clogged fuel nozzle, oxygen sensor failure, and occasional engine fire will all lead to the engine fault indicator light. Among them, when the oil quality is poor, the engine fault indicator lights up at most. Replace the three-way catalyst; 2, according to the accelerator pedal sensor, throttle position sensor, air flow meter, crankshaft position sensor and other faults or poor line contact caused by the engine system fault light lighting related maintenance methods; 3. Some vehicle gearbox system faults are also indicated by the engine fault indicator light. Such as transmission internal fault, slip, high temperature, etc. You need to go to the repair shop for repair inspection. Faults affecting vehicle transmission.