VW Golf DPF Failure Causing Power Loss and Black Smoke

Had similar symptoms on a VW Passat 2016 TDI. The exhaust back pressure sensor showed defective readings, causing the engine to run in limp mode with reduced power. Dark smoke often indicates incomplete DPF regeneration due to faulty pressure monitoring. The pressure sensor connects to the diesel particulate filter and measures exhaust flow. When it fails, the emission control system cant properly regulate DPF regeneration cycles. This causes soot buildup, leading to the symptoms described. In my case, the repair required: Complete diagnostic scan, Removal and testing of pressure sensor, Replacement of clogged sensor lines, Installation of new pressure sensor, Forced DPF regeneration, System reset This was a serious issue requiring immediate attention, as continued driving risks permanent DPF damage. The faulty sensor prevents proper emission control and can lead to complete DPF failure if left unaddressed. Would strongly recommend having it properly diagnosed at a workshop specializing in diesel exhaust systems. A simple DPF regeneration might not be sufficient if the pressure sensor is actually defective.

Thanks for sharing that detailed repair info. Really helpful since I had the exact same symptoms with my Golf last winter, dark smoke, warning lights, the whole deal. The exhaust system pressure sensor was shot, just like in your case. Did the fix hold up well after all this time? Also wondering about the total repair cost since Im trying to figure out if what my local shop quoted is reasonable. Any other issues pop up with the particulate filter or emission control system since getting it sorted?

Happy to report the repair has been completely reliable since fixing the exhaust pressure sensor. The 245€ cost covered the sensor replacement and system reset, which was fair considering the diagnostic work needed. The exhaust system has performed perfectly with no reduced power issues or warning lights. The DPF regeneration cycles now work as intended since the new pressure sensor provides accurate readings. No more dark smoke or diesel particulate filter problems. The repair addressed the root cause, preventing what could have become a much costlier DPF replacement. This type of sensor failure is pretty common on these diesel engines, but catching it early saved me from more extensive exhaust system damage. The proper repair should give you years of trouble-free operation, just make sure the shop fully tests the system after installation. Keep in mind that regular highway driving helps maintain proper DPF function by allowing complete regeneration cycles. With working sensors, the emission control system can now properly manage the whole process.

I finally got my Golf fixed yesterday after dealing with those DPF issues. After getting such helpful advice here, I took it to a diesel specialist who diagnosed the exact same pressure sensor problem. Total repair came to 280€ which included the diagnostic work, new sensor, and a forced regeneration of the particulate filter. The mechanic showed me the old sensor which was completely clogged with soot, causing the low pressure readings in the exhaust system. Since the repair, the engine runs perfectly, no more warning lights or dark smoke from the diesel engine. The power is fully restored and the exhaust system seems to be working as it should. Was worth finding a proper specialist who knew what they were doing with these DPF issues. They even took the time to explain how the whole emission control system works together. Much better experience than my previous mechanic who just wanted to replace the entire DPF without properly diagnosing the actual problem.