Can a Faulty Fuel Cap Trigger the Check Engine Light in a Toyota Hilux?

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Can a Faulty Fuel Cap Trigger the Check Engine Light in a Toyota Hilux?

Many drivers report that a loose fuel cap causes the check engine light to turn on. Have you encountered this issue, and did tightening o r replacing the cap solve it?

Lubaba asked on 11 Feb 2025 12:41:17 pm

1 Answer

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Car Mechanic Expert - on 11 Feb 2025 12:48:58 pm

Yes, a loose o r faulty fuel cap is one of the most common reasons for a Check Engine Light CEL in many Toyota Hilux models.

The EVAP Evaporative Emission Control System detects fuel vapor leaks, and a faulty cap can cause an error code.
Common trouble codes related to this issue include:
P0455 – Large EVAP system leak often a missing o r damaged fuel cap.
P0442 – Small EVAP leak could indicate a weak seal.
If the CEL turns on after refueling, try tightening the cap. If the light persists, replacing the cap might be necessary.