VW Touran Glow Plug System Failure After Repair Job

Having experienced similar symptoms with my 2006 VW Passat TDI, I can relate to this preheating system issue. The constant car preheater warning combined with check engine light typically points to a faulty heating module or compromised wiring connections. In my case, the heating module connector had corroded terminals and damaged pins, causing intermittent electrical contact. This affected the entire ignition system and engine preheat sequence. The smoke under acceleration was a clear indicator that the engine wasnt getting proper pre-heating cycles. The repair involved: Complete inspection of the engine preheat system, Replacement of corroded wiring harness, Installation of new heating module connector, Reprogramming of the glow plug control unit This was indeed a serious issue requiring specialized diagnostic equipment. Continuing to drive with these symptoms risks damaging the engine control unit and glow plugs. The key is finding a workshop with specific experience in VW diesel preheating systems. The vehicle heater symptoms you describe are too complex for general repairs and require proper diagnostic tools to identify the exact failure point in the system. A complete system diagnosis should be your first step before any parts replacement.

Thanks for sharing your experience with the preheating issues. Same problem got fixed on my Touran last winter. The defective part turned out to be the heating module, plus they found some damaged wiring near the engine preheat sensors. Your solution sounds pretty much like what they did on mine. Did everything work fine after the repair? Mind sharing what the total cost was? Been running smoothly since the fix but wondering if I paid too much for the work.

The preheating control unit repair on my Passat worked out perfectly after fixing the electrical fault. I paid 95€ for the cable and plug connection replacement, which seems reasonable compared to what others typically spend on similar vehicle heater repairs. The car electronics have been functioning flawlessly since the fix, no more warning lights or engine preheat issues. The smoke under acceleration completely disappeared, confirming the control unit was indeed the root cause. A properly working preheating system makes a huge difference, especially during cold starts. The engine now runs smoother and the heating performance is back to normal. Its definitely worth getting these issues fixed by a qualified technician who understands the complexity of diesel preheating systems. The repair cost was actually quite fair considering the technical diagnosis required and the specialized nature of the control unit work. Most importantly, the fix has proven durable with no recurring issues since the repair.

After getting your feedback, I decided to visit a different mechanic for a second opinion. The new shop diagnosed the exact same heating module issue you mentioned. They found the faulty control unit and damaged wiring near the engine preheat system. Total repair came to 420€ including: New heating module, Wiring harness replacement, Labor for electrical fault diagnosis, Control unit programming More expensive than your repair but the ignition system now works perfectly. No more warning lights or smoke issues. The engine starts smoothly even in cold weather. Definitely worth fixing it properly rather than continuing with a compromised preheat system. I appreciate the detailed insight you shared. It helped me understand the problem better and gave me confidence to seek out a specialist who could properly address the electrical issues. Thanks for the helpful advice.