Can a loose o r damaged fuel cap trigger the check engine light CEL in the Changan Alsvin?

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Can a loose o r damaged fuel cap trigger the check engine light CEL in the Changan Alsvin?

Many users report that a faulty fuel cap leads to the check engine warning. How sensitive is the Alsvin’s fuel system to pressure leaks caused by cap issues?

Qalb E Momin asked on 11 Jun 2025 13:20:17 pm

1 Answer

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Car Mechanic Expert - on 11 Jun 2025 13:29:59 pm

Yes, a loose o r cracked fuel cap can trigger the Check Engine Light CEL in the Changan Alsvin. The vehicle’s EVAP Evaporative Emission Control system monitors the fuel tank’s seal integrity. If a leak o r pressure is detected—often due to a faulty fuel cap—the system logs an error code and triggers the CEL. Codes like P0440 Evap System Malfunction o r P0455 Large Evap Leak Detected are commonly associated with fuel cap issues. The Alsvin’s system appears quite sensitive to even minor sealing faults, making the cap a common culprit for unexplained warning lights.