Why is the van's malfunction indicator light on?

1 Answers
SanJames
07/30/25 12:16am
The reasons for the van's malfunction indicator light being on are: 1. Sensor issues: When the water temperature, crankshaft position, air flow, intake temperature, or oxygen sensors are damaged, have poor contact, or experience signal interruption, the vehicle's ECU cannot accurately obtain engine data; 2. Maintenance issues: Not performing regular maintenance and poor driving habits can increase the burden on engine operation; 3. Fuel quality issues: The fuel added to the vehicle has a specific grade, and failing to add as required can cause engine wear; 4. Poor mixture combustion: This can lead to engine carbon buildup or knocking issues, which will be detected by the engine's oxygen sensor; 5. False faults: These can occur due to impacts while driving, tampering with certain engine connectors, or temporary signal interruptions in the ECU.
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