VW Fox Cruise Control Failure After Throttle Swap

Had a similar issue on my 2012 VW Polo TDI. The cruise control malfunction showed up after routine maintenance and turned out to be a faulty system caused by a loose wiring connection at the throttle body. The diagnostic scan revealed multiple error codes pointing to inconsistent signals between the throttle position sensor and the cruise control module. The non-functional cruise control was traced to damaged pins in the main connector plug going to the throttle body. This is typically not a serious repair but requires careful troubleshooting since car electronics can show similar symptoms for different root causes. The mechanic had to inspect the entire wiring harness from the throttle body to the fuse box to find the exact point of the malfunction. Given your recent throttle body replacement, there is a high chance the connector was not fully seated or got damaged during installation. Would recommend having the shop check the wiring connections first before replacing any components. The fix requires proper connector inspection, pin terminal replacement if needed, and recalibration of the throttle position sensor using diagnostic equipment.

Thanks for sharing your experience with the VW Polo TDI issue. Sounds exactly like what I am dealing with now. I will definitely have them check the wiring connections first, especially around the throttle body area. Since my car electronics are showing similar error codes, it makes sense to inspect the connectors before replacing any parts. By the way, do you remember roughly how much you paid for the repair? Also, has your cruise control worked properly since the fix or have you noticed any other issues?

Regarding the cost, I paid 95€ for the repair which included diagnosing the faulty system and fixing the defective cable connection. The mechanic found and repaired a damaged connector near the throttle body. The cruise control has worked flawlessly since the fix, with no error messages or malfunctions for over a year now. The car electronics all function normally, and the diagnostic scan shows no stored error codes related to the throttle body or cruise control systems. This confirmed my initial suspicion that the issue was related to wiring rather than a component failure. A proper inspection of all connections during installation could have prevented the problem, but at least it was a straightforward fix once identified.

I took your advice and had the car checked at the repair shop yesterday. The mechanic found exactly what you described, a loose connection in the wiring harness near the throttle body actuator. Some pins were slightly bent during the previous repair work. The total repair cost came to 120€ which covered the diagnostic scan and fixing the faulty system. The mechanic spent about an hour testing all connections and recalibrating the cruise control module. Just drove the car today and everything works perfectly now. No more error messages on the display and the cruise control functions as it should. Really glad it turned out to be just a wiring issue rather than needing to replace any major components. The repair shop also documented the fix in case any similar malfunction occurs in the future. Thanks again for pointing me in the right direction before I spent money on unnecessary parts replacement.