VW Suran Engine Problems Linked to Temperature Sensor

I had a similar issue with my 2014 VW CrossFox last year, and being somewhat experienced with basic car maintenance, I initially tried diagnosing it myself. The symptoms matched yours exactly, rough engine performance, reduced power, and the check engine light. The IAT sensor was indeed the problem. Initially, I cleaned the sensor thinking it might just be dirty, but the issue persisted. Took it to my regular workshop where they confirmed the diagnosis with their professional diagnostic tool. The car sensor was completely faulty, providing incorrect air temperature readings to the ECU. This caused the fuel mixture to be off, explaining the poor performance. The repair was straightforward, they replaced the IAT sensor and cleared the error codes. Total cost was 155€ including parts and labor. The car has been running perfectly since then. Before suggesting specific solutions for your case, could you share: Have you noticed if the problems get worse during specific weather conditions? What error code is your diagnostic tool showing? Have you had any recent work done on the air intake system? Does the problem occur more during cold starts? This information would help determine if your situation matches what I experienced with my CrossFox.

My mileage reading is 130695km and I had my last service 3 months ago. Thank you for sharing your detailed experience. Your questions helped me gather more information: The temperature reading issues definitely worsen in cold weather. The diagnostic tool shows error code P0113, which points to the IAT sensor circuit malfunction. No recent work has been done on the air intake system. The problem is most noticeable during cold starts, taking longer than usual to reach normal operating temperature. Based on your experience and repair costs, replacing the IAT sensor seems like a reasonable next step. Were there any specific brands of car sensor you would recommend using for the replacement?

Thanks for providing those additional details about your VW. The P0113 code and cold weather symptoms definitely align with my intake air temperature sensor experience. For the replacement sensor, I used a Bosch unit which has worked flawlessly since installation. Make sure to get an OEM-quality sensor, the small price difference is worth it for reliability. A few tips from my repair experience: The sensor connector can be fragile, handle with care when disconnecting, Clean the sensor housing area well before installing the new unit, After replacement, clear the error codes and let the engine run through a complete warm-up cycle, Double check all air intake connections are properly sealed The rough engine running and performance issues should resolve immediately after installing a working temperature sensor. The ECU needs accurate temperature readings to calculate proper fuel mixture. Since your mileage is similar to what mine was, also inspect the air intake boot for any small cracks while you have things apart. These can develop over time and cause similar symptoms.

Based on your helpful advice and the information shared, I'll proceed with replacing the IAT sensor. Your experience with a similar VW model and the matching P0113 error code gives me confidence in this repair path. The fact that my engine issues worsen in cold weather and during cold starts strongly supports the diagnosis of a faulty intake air temperature sensor. The car diagnostics pointing to the same issue you encountered makes this a clear direction for repair. I appreciate the tip about using a Bosch sensor and will definitely go with an OEM-quality part. The installation advice about handling the connector carefully and checking the intake boot will be very useful during the repair. Since the total repair cost you mentioned was around 155€, this seems like a reasonable investment to resolve these engine issues. I will make sure to follow your suggestion about clearing the codes and running a complete warm-up cycle after installation. Will proceed with the repair this week and hope to see the same positive results you experienced with your vehicle. The step-by-step guidance has been invaluable for tackling this air temperature sensor replacement.