T-Cross Diesel: Engine Light and Rough Running Fix

I experienced similar symptoms on my 2017 VW Tiguan 2.0 TDI. The rough running and check engine light pointed to a faulty fuel injection system. The drift compensation error typically indicates an injector that is delivering incorrect fuel quantities. A full diagnostic scan revealed one injector was not atomizing fuel properly, causing uneven combustion. The repair required replacing the problematic injector and performing a reset procedure on the engine control unit to restore proper fuel economy. This is a significant repair that requires specialized equipment to program the new injector values into the system. The onboard diagnostics will continue showing errors until this complete procedure is done correctly. While the repair is complex, it is essential as faulty injectors can lead to increased fuel consumption, drop in power, and potential engine damage if left unaddressed. Given your low mileage, this could be covered under warranty. When talking to the mechanic, ask specifically about: Full injector diagnostic test results, Whether programming for new injector values is included, Warranty coverage verification, Post-repair testing to confirm drift compensation values are normal Getting this fixed at a qualified shop with proper diagnostic tools is crucial for long-term reliability.

Thanks for sharing your experience. It does sound exactly like what I am dealing with. The injector diagnostic makes perfect sense given the symptoms. Performance tuning will require proper airflow sensors calibration too from what I understand. Did you remember the total cost of the repair? Also, has the system reset held up well since the fix, or have you noticed any other issues popping up? I want to make sure I budget correctly and know what to expect long term before heading to the shop.

After getting the work done last month, I can confirm the reset quantity drift compensation issue has been completely resolved. The repair cost came to 515€ for replacing the defective injection valve and performing the necessary system reset. The mechanic also performed a thorough airflow sensors check as part of the performance tuning process. The fuel injection system is now working flawlessly, with no error codes or rough running since the fix. The compensation adjustment values are staying within normal ranges, and fuel economy has returned to factory specifications. I monitor the diagnostic readings regularly and everything remains stable. My suggestion would be to get it addressed soon, as waiting could lead to more extensive fuel system problems. While the cost was significant, having the complete repair done with proper diagnostic equipment and programming proved to be worth it for restored performance and peace of mind.

Just had my car back from the shop and wanted to update everyone here. The issue turned out to be exactly what was suggested, a faulty injector causing the drift compensation errors. The onboard diagnostics were spot on. The total repair came to 490€, which included the new injector and complete reset procedure. The mechanic I found specializes in diesel systems and had the right diagnostic equipment to properly program everything. They also checked all airflow sensors and verified the compensation adjustment values were correct after the fix. Car runs perfectly smooth now, no more check engine light, and fuel economy is back to normal. Really glad I got this sorted quickly before it could cause more problems. The whole process took about 4 hours and they provided a full report showing before and after readings. For anyone facing similar symptoms, definitely get it checked by a qualified shop with proper diagnostic tools. The investment in getting it done right is worth avoiding potential long-term engine damage.