VW T-Cross Check Engine Light: OBD Scan Insights

Having dealt with a similar situation on my 2021 VW T-Roc (which shares many components with the T-Cross), I can share some relevant experience as someone with moderate car repair knowledge. The check engine light and system readiness issues often appear after the car computer gets reset, either from battery disconnection or after running diagnostics. The exhaust system monitoring and other readiness tests need several drive cycles to complete. In my case, after the OBD2 diagnostics check, I just needed to: 1. Drive normally for about 50-80km 2. Include both city and highway driving 3. Let the engine reach full operating temperature 4. Avoid turning the car off during this process The warning lights cleared themselves after completing these drive cycles, as the car diagnostics system needed time to run all its self-tests. Cost was 0€ since no actual repairs were needed. Before suggesting more specific solutions, could you share: What error codes your OBD scanner showed? Have you recently had any battery work or computer reset done? Does the engine performance feel different? What fuel type does your T-Cross use? This would help determine if your situation is similar or might need different attention.

Last service completed at 10000km and current mileage 14985km. My situation seems quite different. After running the OBD scanner again yesterday, it shows error code P0456 which points to a small evap system leak. The engine performance feels normal and I have not had any battery or computer work done recently. The car runs on 95 octane gasoline and the emissions test readiness monitors are all incomplete except for the catalyst and o2 sensors. I checked the gas cap which is properly sealed, but the check engine light persists. Would be helpful to know if others found leaks in specific areas of the evap system or if there are common failure points to check before taking it to a service center.

Thanks for providing those details about the P0456 code and current situation. You are right, my earlier suggestion about drive cycles alone probably will not resolve an actual evap leak. With my T-Roc, I had the same P0456 code and initially also checked the gas cap. When that was not the fix, a vehicle inspection revealed a cracked vacuum line near the charcoal canister. The brittle line was causing the small evap leak the car diagnostics system detected. The interesting part is even after fixing the line, I needed to: 1. Clear the code with the OBD scanner 2. Complete several drive cycles 3. Wait for all emissions test readiness monitors to reset Total repair including parts was around 150€. Much better than replacing the entire evap system. Common evap leak points to check: Purge valve connections, Vent valve seals, All vacuum lines, especially near connection points, Charcoal canister for cracks Since your vehicle is relatively new with low mileage, this should be covered under warranty. Getting it checked soon prevents any risk of failing future emissions tests. Let us know what the service center finds. The location of the leak might help other T-Cross owners facing similar check engine warnings.

The code P0456 definitely provides more clarity about my situation. After looking at the suggested common failure points, I did a careful visual inspection around the charcoal canister area and vacuum lines but could not spot any obvious cracks or loose connections. Given the car is still under warranty and all my check engine diagnostic data points to an evap system leak, I have scheduled a service appointment next week. The onboard diagnostics are still showing incomplete system readiness for most monitors, so hopefully they can identify and fix the leak source quickly. Will update this thread once I get the results from the service center inspection. This might help other T-Cross owners who get similar evap leak codes and have check engine warnings with incomplete readiness monitors. Hoping it is just a minor vacuum line issue like the previous case shared here, rather than a larger evap system component failure.