Why is my Suzuki Swift showing a check engine light after refueling?

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Why is my Suzuki Swift showing a check engine light after refueling?

Every time I refuel my Suzuki Swift, the check engine light comes on shortly afterward. Mechanics suggested it might be related to a loose o r cracked fuel cap o r an issue with the EVAP system. Is this a known problem with Swift in Pakistan, and how can I fix it without expensive diagnostics?

Gari Specialist asked on 02 May 2025 17:43:03 pm

1 Answer

14 views |

Gari Master - on 02 May 2025 17:45:41 pm

If your check engine light appears after refueling, its often linked to the EVAP system, which is designed to prevent fuel vapor from escaping. A loose fuel cap is the most common culprit.

Causes:

Loose o r missing fuel cap even one wrong turn can trigger the sensor.

Cracked EVAP hoses o r purge valve malfunction.

Overfilling the fuel tank, causing raw fuel to enter the vapor system.

A faulty EVAP pressure sensor o r leak detection pump.

Fixes:

First, tighten o r replace the fuel cap, then reset the system or wait a few drives.

Have a scanner check for EVAP-related error codes like P0455 o r P0442.

Avoid topping off fuel after the nozzle clicks off.

Replace damaged EVAP components, like the purge valve o r canister, if faulty.