Can a Cracked o r Damaged Fuel Cap Cause the “Check Engine” Light in Wagon R?

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Can a Cracked o r Damaged Fuel Cap Cause the “Check Engine” Light in Wagon R?

After a recent fuel refill, my Check Engine light came on in my Suzuki Wagon R. A mechanic told me the fuel cap might be cracked o r not sealing properly. Can such a small issue really trigger a warning light?

Gari Specialist asked on 24 May 2025 14:26:01 pm

1 Answer

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Gari Master - on 24 May 2025 14:29:08 pm

Yes, a cracked o r poorly sealing fuel cap can trigger the Check Engine light CEL. The Wagon R has an Evaporative Emission Control System EVAP that detects fuel vapor leaks. If the cap isnt sealing properly, it registers as a leak, causing the ECU to activate the CEL.

Signs of fuel cap-related CEL:

Light appears shortly after refueling.

Slight fuel smell around the car.

Light disappears after replacing o r tightening the cap.

Tip:
Before going for expensive diagnostics, try replacing o r tightening the fuel cap and driving a few kilometers. If the issue was the cap, the light may go off automatically.