VW A2 Engine Mount Issues Causing Rough Idle Problems

As someone with moderate experience working on cars, I had a very similar issue with my 2002 A3 petrol. The symptoms you describe match exactly what I experienced, rough idling and error codes pointing to mount-related problems. Initially, I suspected a transmission mount issue, but after inspection, it turned out to be a loose mounting bracket connection. The rubber mount itself was actually fine, but the vibration issues were caused by a damaged cable harness and connector near the mount assembly. The repair involved: Diagnostic scan, Visual inspection of all mounting points, Replacement of the damaged wiring connector, Proper securing of the mounting bracket Total cost was 95 Euro including labor and parts. The whole job took about an hour and completely resolved the vibration issues and error codes. To provide more specific advice for your situation, could you share: Which error codes are you getting? Does the rough idle change when shifting between Park and Drive? Have you noticed any clunking sounds when accelerating or braking? Is there visible wear on any of your engine or transmission mounts? This information would help determine if your issue is similar to what I experienced or if you might be dealing with actual mount failure.

Thanks for sharing your experience. After having my car serviced last month at 114560KM, the issue started getting worse. The defective engine symptoms match what you described, especially the vibration issues when shifting between gears. I did check under the car and noticed significant wear on the motor mount, particularly the rubber sections. There is also a concerning amount of movement when revving the engine, which seems to confirm the mounting bracket has deteriorated. The error codes are pointing to P0117 and P0325, though these could be related to the mount failure causing sensor misalignment. The clunking sound is most noticeable during acceleration, just as you mentioned. Would you recommend replacing all mounts as preventive maintenance while they are working on it?

Thanks for those additional details. The symptoms you describe definitely align with mounting system issues, but your case sounds more severe than what I encountered on my A3. While my issue was resolved with just the wiring fix, the significant movement you are seeing during engine revs strongly suggests actual mount failure rather than just loose connections. The combination of worn rubber sections and excessive engine movement is a clear indicator of mount wear beyond normal limits. Given the mileage and age, replacing all mounts would be sensible preventive maintenance. When I had my mount work done, the mechanic pointed out that these components typically start failing around 100000-120000km. The labor cost difference between replacing one versus all mounts is minimal since they are already accessing the area. Based on my repair experience, a full mount replacement including: Motor mount, Transmission mount, Associated mounting brackets Typically runs 350-450 Euro for parts and labor. The error codes you mentioned could indeed be triggered by the defective engine mount allowing excessive movement. This can affect sensor readings and create false signals. In my case, once the mounting system was properly secured, similar sensor-related codes cleared up completely.

Given everything shared, I think I will go ahead with the full mount replacement. The symptoms match too closely to ignore, and the cost difference between replacing one versus all mounts makes sense given they are already doing the labor. Your experience with the P0117 and P0325 codes clearing up after mount repairs is particularly reassuring. The fact that my rubber mount is visibly worn and the engine has excessive movement during revs seems to confirm this is the right path forward. I will schedule the repair next week to replace: Motor mount, Transmission mount, Related mounting brackets The 350-450 Euro estimate helps set realistic expectations for the work. My failed mount is clearly causing multiple issues, and addressing all mounting components at once should prevent having to revisit this issue again soon. Thanks for helping me understand what I am dealing with and providing such detailed information about your repair experience.