how to troubleshoot EVAP system leak in BMW X3 G01 (2018-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to avoid electrical issues.

2. Inspect the Gas Cap

• Remove the gas cap and check for any cracks or damage.
• Clean the gas cap and the filler neck with a lint-free cloth.
• Reinstall the gas cap and ensure it clicks securely.

3. Smoke Test Procedure

• Connect the smoke machine to the EVAP service port.
• Introduce smoke into the system and look for visible leaks.
• Pay special attention to the EVAP canister, hoses, and connections.

4. Check and Replace Components

• If leaks are found, replace damaged hoses or the EVAP canister as needed.
• For the purge valve, disconnect the electrical connector and remove it for inspection. Replace if defective.

5. Reconnect and Test

• Reconnect all components and the battery.
• Clear any error codes using the OBD-II scanner.
• Start the vehicle and monitor for any new codes or leaks.

6. Final Checks

• Perform a test drive to ensure that the check engine light does not reappear.
• Re-scan the vehicle to confirm no EVAP-related codes are present.