VW Golf Hybrid Engine Issues Traced to IAT Sensor

Had a similar issue with my 2015 VW Passat Hybrid about six months ago. As someone with moderate DIY experience, I first tried cleaning the air intake system, but the problems persisted. The symptoms matched yours exactly, sluggish performance, rough running, and check engine light. The temperature reading from the intake air temperature sensor was clearly off, showing implausible values through my basic scan tool. Took it to a workshop where they confirmed the air sensor was defective. The entire repair, including diagnostics and replacement of the temperature sensor, came to 155€. After replacement, all issues cleared up immediately, normal power returned and the check engine light went off. To better assist with your situation, could you share: Any additional error codes showing up? How long has the check engine light been on? Have you noticed if the problems get worse when the engine is cold or hot? Are there any unusual sounds when accelerating? With this information, we can better determine if your symptoms align with a typical air temperature sensor failure or if there might be related issues to investigate.

Just had my 6-month service last week, and I am experiencing similar engine issues. The air temperature sensor diagnostic seemed accurate in my case, as the mechanic found the wiring harness was damaged, causing incorrect temperature readings. After fixing both the harness and replacing the sensor, the car runs perfectly again. The total repair with parts and labor was 210€. The car diagnostics confirmed it was sending proper signals after the fix. Before jumping to a full sensor replacement, have the shop check the wiring connections first. Sometimes corrosion or loose connections can mimic a failed sensor. Mine showed the same symptoms, power loss and rough running, but the wiring was the root cause. If anyone needs the part number for this specific air sensor, let me know. Just remember newer diagnostic tools are better at pinpointing whether its a sensor or wiring issue.

Thanks for sharing your experience with the wiring harness issue. Actually, after my sensor replacement, I had them inspect the entire wiring setup as a precaution. The diagnostic tool readings have remained stable since the repair, suggesting the new air sensor is working correctly. One thing I learned from my repair is that intake air temperature sensors often fail gradually. Mine started showing inconsistent readings before completely failing. The engine issues became more noticeable in cold weather when accurate temperature readings are most critical. Good point about checking connections first. When my workshop did the initial diagnostic scan, they also tested the wiring continuity before concluding the sensor itself was faulty. In my case, the sensor was the culprit, but your experience shows why a thorough check of the whole system is important. For anyone else facing similar engine issues: make sure the shop does a complete system diagnostic rather than just swapping parts. The intake air sensor is a common failure point, but as we both experienced, proper diagnosis is key to avoiding unnecessary repairs. Would be interested to know if others have found their temperature sensor failures were also linked to wiring problems. Our experiences show there can be multiple causes for the same symptoms.

The IAT sensor diagnostic was accurate, and my mechanic identified a damaged wiring harness causing incorrect intake air temperature readings. After repairing both the harness and replacing the sensor, the car runs perfectly again. Total repair cost including parts and labor came to 210€. The diagnostic tool confirmed proper signal transmission after the fix. Important tip for others: have the shop check wiring connections before jumping to a full sensor replacement. Corrosion or loose connections can mimic a failed sensor. My car showed identical symptoms, power loss and rough running, but the wiring was the root cause. I have the specific part number for this air sensor if anyone needs it. Just remember newer diagnostic tools are better at determining whether engine issues stem from the sensor itself or wiring problems.