VW Polo Mount Failure Causes Rough Idle Issues

Had a similar issue with my 2017 VW Golf diesel. Being somewhat experienced with basic car maintenance, I first noticed increasing vibration issues during idle, especially when the AC was running. The workshop diagnosed it as a loose cable connection at the mounting bracket area, which was causing erratic sensor readings and leading to those engine management issues. The failed mount wasnt actually the problem, it was the wiring near the motor mount that had worked itself loose over time. The fix involved securing the connection properly and checking all surrounding mounting brackets. Total repair cost was 95€ including diagnostic time. The vibration problems disappeared completely after this repair. For your Polo, before jumping to conclusions about engine mount replacement, would be good to get more specific details: Does the vibration change when shifting from P to D? Are the vibrations worse when the AC is running? What specific error codes is your ECU showing? Have you noticed any unusual noises along with the vibrations? This information would help determine if youre dealing with a similar electrical issue or an actual failed mount problem.

Thanks for sharing those details. My Polo just had its service at 93429km and the issue started shortly after. I did notice the vibrations getting worse when shifting between gears, and there is a distinct clunking sound when putting it in reverse. The error codes point to P0117 and P0118. Based on your experience, this sounds different from the electrical issue you encountered. The symptoms suggest a defective engine mount rather than wiring problems. The transmission mount area specifically shows visible wear when inspected. Would you recommend getting a second opinion before proceeding with a full mount replacement? The workshop quoted 450€ for parts and labor, which seems steep for mount work.

Based on your description, this does sound different from my earlier wiring issue. The clunking noise during gear changes and visible mount wear are classic indicators of a defective engine or transmission mount problem. After my initial cable repair, I actually faced a similar mount failure about 6 months later with my Golf. The symptoms matched yours exactly, especially that distinct clunking when shifting into reverse. The visible wear you mentioned is particularly telling, as motor mount deterioration typically shows clear physical signs. The 450€ quote is actually in line with what I paid for my mount replacement. The labor costs are significant because accessing the mounting bracket requires considerable disassembly. My repair included: New engine mount, Transmission mount replacement due to related wear, New hardware and brackets The repair completely resolved both the uneven idling and the clunking. Those error codes (P0117/P0118) could be related to engine movement causing sensor issues due to the failed mount. A second opinion is always worthwhile, but given the symptoms and visible mount wear, mount replacement seems inevitable. Just ensure they check all mounting points, as wear on one mount often leads to increased stress on others.

Yes, I greatly appreciate everyone's input on this issue. After reading through the responses and comparing symptoms, I'm convinced the mount failure diagnosis is correct. The clunking during gear changes and visible transmission mount wear match exactly what others have described. The rubber mount deterioration seems to be causing both the vibration issues and those sensor-related error codes. Given that mount wear often affects multiple mounting points, the 450€ quote for a complete mount replacement actually sounds reasonable. I scheduled an appointment with another workshop for next week just to get that second opinion, but based on the matching symptoms and detailed repair experiences shared here, I expect they will confirm the defective engine mount diagnosis. The comprehensive repair approach of replacing both the engine mount and transmission mount makes sense to prevent future issues. Will update once the repair is completed, but feeling much more confident now about proceeding with the mount replacement. When multiple experienced owners report such similar mount failure patterns, it really helps validate the diagnosis and proposed fix.