VW Taigo Engine Stalling: IAC Valve Troubleshooting

I had a very similar issue with my 2019 VW T-Cross with the 1.0 TSI engine. As someone with moderate car repair experience, I initially thought it was the IAC valve too when my engine started stalling at idle. After taking it to the workshop, they found the throttle body and intake system were heavily contaminated, causing irregular idle speed. The buildup was affecting proper air flow, making the engine stall frequently at stops. The complete service included: Thorough throttle body cleaning, Intake system decontamination, Computer system reset, Idle speed adjustment Total cost was 425€ and it completely resolved the engine stalling issues. The car has been running smoothly for months now with stable idle. To provide more specific advice about your Taigo: Which engine variant do you have? How many miles/kilometers on the odometer? Does the stalling happen only when the engine is cold or also when warm? Have you noticed any unusual sounds when idling? This information would help determine if your issue is similar and whether the same solution might work for you.

Last service was done at 65000km and the car has been running fine until now. After your detailed explanation, I checked further and noticed the stalling mostly happens during warm idle. The engine makes a slight rattling noise right before it stalls. Running the 1.0 TSI engine variant. The air intake symptoms you described sound very similar to what I am experiencing. Will look into getting the throttle body cleaned first rather than jumping straight to IAC valve replacement. Thanks for the detailed breakdown of what worked in your case.

The symptoms you describe match exactly what I experienced with my T-Cross before getting it fixed. That slight rattling noise before stalling was also present in my case, and it turned out to be directly related to the restricted air flow through the dirty throttle body. Since you have the same 1.0 TSI engine and similar mileage, I strongly suggest starting with the throttle body cleaning. These engines are particularly sensitive to air intake deposits, which can significantly affect idle stability. Quick tip from my experience: Make sure they also check the air filter while cleaning the system. In my case, it was partially clogged and contributed to the engine stalling issues. The workshop found that the combination of a dirty throttle body and restricted air filter was causing the IAC valve to work harder than necessary to maintain proper idle. After the cleaning, they should perform an idle relearn procedure to help the engine computer adjust to the restored air flow. This step was crucial in my repair process and helped prevent the stalling from recurring.

The warm idle stalling issue has definitely become clearer now. All signs point to throttle body contamination rather than a faulty IAC valve, especially since the symptoms match almost exactly. Having the same engine type makes the comparison even more relevant. Going to book the car in next week for a thorough throttle body cleaning and air intake system check. Makes sense to start with the less expensive cleaning option before considering valve replacement. Will make sure to request an air filter inspection and idle relearn procedure as part of the service. Really appreciate the heads up about the idle relearn step, thats something I might have missed otherwise. Will update the forum after the service to confirm if cleaning the air intake system resolved the engine stalling. The detailed cost breakdown is helpful for budgeting too, though hopefully the final bill comes in under 425€.