T-Roc DPF Sensor Issue Causes Smoke & Failed Regen

I experienced a very similar issue with my 2021 VW Tiguan diesel about 6 months ago. The symptoms you describe match exactly what I encountered, especially the failed DPF regeneration and exhaust smoke issues. After monitoring the engine performance for a week, I noticed significant power loss during acceleration. The workshop confirmed it was a faulty exhaust back pressure sensor affecting the emission control systems. The diagnosis took about an hour, and they found the sensor was sending incorrect readings to the engine control unit. Total repair cost was 245€, including parts and labor. The fix completely resolved all symptoms and restored proper vehicle emissions levels. Definitely worth addressing soon, as continuing to drive with these symptoms can lead to more expensive DPF damage. Before suggesting more specific solutions, could you share: Current mileage on your T-Roc, How long the symptoms have been present, Any recent maintenance work performed, Whether you do mostly city or highway driving This information would help determine if your case matches my experience and if there might be other factors to consider. To protect your engine performance, I would recommend getting this checked soon. A faulty pressure sensor can lead to incomplete regeneration cycles and potential long-term damage to your emission control system.

Thanks for sharing your experience. This does sound similar to my situation. I had my latest service just 2 weeks ago and have currently 18879km on the odometer. The sensor symptoms started shortly after the service, which makes me think there might be a connection. Vehicle diagnostics show consistent error codes related to the exhaust system. The engine performance has definitely been affected, especially during cold starts. I will schedule a workshop visit this week based on your feedback about potential DPF damage. Better to address emission control issues early than risk more extensive repairs later.

Thanks for those additional details. Given you mentioned the issues started after your recent service, this strongly reminds me of my Tiguan case. After my regular service, a similar pattern emerged, and the workshop later discovered the exhaust back pressure sensor had been slightly displaced during routine maintenance. The timing of your symptoms points to possible unintentional sensor disturbance during the service. In my case, car maintenance records showed the sensor area was accessed for a different repair task. Since your mileage is relatively low at 18879km, this is almost certainly not regular wear and tear of the exhaust system. My recommendation based on identical symptoms: show the workshop your error codes and specifically request inspection of the exhaust sensor connections and mounting. The cold start issues you mentioned are typical when the back pressure readings are incorrect. Auto repair costs in this case should be minimal if caught early, especially if related to the recent service work. Make sure to mention the service timing, it helped streamline my diagnostic process and kept repair time shorter. Consider asking about the sensor calibration process after any fix. For my Tiguan, this was crucial for proper DPF regeneration to resume.

Thanks for the detailed information and guidance. Your Tiguan experience really helps put my mind at ease about the likely cause and solution. The parallels between our situations, especially the service timing, make a lot of sense. I just called the workshop and scheduled an appointment for tomorrow morning. I mentioned the exhaust sensor concerns and the recent service connection. They confirmed theyll start with vehicle diagnostics focusing on the emission control components, particularly the back pressure sensor mounting. The service advisor seemed to agree that the timing suggests possible maintenance-related issues. Ill make sure they check the sensor calibration after any repairs, as you suggested. Given the potential impact on engine performance and DPF health, Im glad to be addressing this quickly. Will update once I know more about what they find. Thanks again for helping narrow down the likely cause and highlighting the importance of prompt car maintenance for these emission control issues.