T-Roc Ventilation Valve Issues Cause Power Loss & Smoke

I had almost identical symptoms with my 2019 VW Golf. As someone who does basic maintenance but leaves major repairs to professionals, I recognized these classic PCV system issues. The unstable idle, power loss, and smoke are textbook signs of crankcase ventilation problems. In my case, the PCV valve had failed, causing excessive pressure in the system. This affected emissions and engine performance significantly. After noticing these symptoms, I took it to a certified workshop. They diagnosed a faulty PCV valve and some related seals that needed replacement. The entire repair, including parts and labor, cost 360€. The fix resolved all symptoms, the smoke disappeared, power returned to normal, and the idle smoothed out. The repair process took about 4 hours. Regular maintenance checks could have caught this earlier, as PCV systems typically show gradual deterioration before complete failure. What engine size does your T-Roc have? This would help compare if your situation matches mine more precisely. Also, have you noticed any oil consumption changes or heard unusual whistling sounds from the engine bay?

Thanks for sharing your experience. I just took mine for a check after seeing similar symptoms at 74189km. Turns out the valve was completely clogged, restricting proper crankcase ventilation. The smoke was actually due to pressure buildup forcing oil into places it shouldnt be. My maintenance records showed the last service was just 3 months ago, but this still developed. The idle issue definitely matches what you described, mine was particularly noticeable when cold. While not identical to your Golf case, the workshop confirmed this is common across several VW models. They quoted me 390€ for a complete fix including new seals and cleanup of the ventilation system. Has your repair held up well since then? Wondering if I should expect any related issues to pop up after getting this fixed.

Thanks for the follow-up about your T-Roc repair quote. Since fixing my Golf PCV system last year, everything has remained solid with no recurrence of symptoms. The repair has completely held up, no more smoke, stable idle, and power delivery is still perfect. The 390€ quote sounds right in line with current parts and labor costs. The complete system cleanup they suggested is crucial, a clogged PCV valve often leaves residue in connected components that needs clearing to prevent future issues. The fact that your valve failed just 3 months after service is unusual but not unheard of. In my case, the workshop explained that modern direct injection engines can sometimes accelerate PCV system wear. The crankcase pressure issues can develop quickly if conditions are right. Looking at idle performance is a reliable indicator, my Golf now maintains a steady idle even during cold starts, which confirms the fix addressed the root cause. The stable idle and absence of any check engine lights suggest the repair was comprehensive. A word of caution from my experience: make sure they check the intake manifold for oil residue during the repair. A failing PCV valve can leak oil into the intake, and cleaning this prevents potential issues down the line.

Thanks for the detailed information about your Golf repair. My T-Roc is booked in for tomorrow and your experience has been really helpful. After comparing the symptoms, I feel more confident about the diagnosis and expected costs. The ventilation valve issue definitely explains the smoke and unstable idle I have been seeing. The pressure buildup makes total sense given how the symptoms developed. Its concerning that this happened so soon after my regular service, but at least the leak and related problems will be fixed properly now. The workshop mentioned theyll do a full system inspection while fixing the valve, including checking for oil residue in the intake manifold like you suggested. At 390€, the repair seems reasonably priced compared to your experience. Will update once the work is done, but its reassuring to hear your repair has held up well with no recurring issues. The smoke during acceleration and power loss have been quite worrying, so Im looking forward to having this resolved.