VW Touran Glow Plug Warning Light Won't Turn Off

I dealt with similar symptoms on my 2014 VW Tiguan diesel. The glow plug indicator stayed lit constantly and the engine light came on during cold starts. Initially thought it was just one faulty glow plug, but diagnostic testing revealed two failed glow plugs and damaged wiring to the glow plug control module. The repair involved replacing all glow plugs as a set since they were showing signs of wear. The wiring harness also needed replacement due to heat damage. This was actually quite serious since bad glow plugs can lead to hard starting, engine misfire, and potential engine damage if left unfixed. The diesel engine needed all new glow plugs because mixing old and new ones often causes electrical system imbalances. The job took about 4 hours since accessing the glow plugs required removing several components. After the repair, cold starts improved significantly and both warning lights cleared from the system. I strongly recommend getting this checked soon, as continuing to drive with faulty glow plugs can cause starting problems and potentially damage the engine control unit. The complete diagnosis should include checking the glow plug control module and wiring, not just the plugs themselves.

Thanks for sharing the details about your Tiguan repair. Your symptoms match what I experienced with my Touran. I also ended up having to replace the entire glow plug set plus some wiring. My cold starts are perfect now and the engine light cleared completely. How much did you end up paying for the full repair? Just curious to compare costs. Also, have you had any other glow plug related issues since the fix? My diesel car has been running smoothly for the past few months, but I like to stay informed about potential problems that might come up.

Just got your message about the repair costs. The total came to 440€ for my Tiguan glow plug repair, which included parts and labor. Pretty relieved to hear your Touran is also running well after fixing the same issue. Since getting the repair done, my diesel engine has been performing flawlessly with no check engine lights or rough idle problems. The cold starts are consistently smooth, even during the coldest mornings. The fuel efficiency actually improved slightly after the fix, which was an unexpected bonus. For preventive maintenance, I now keep a closer eye on the glow plug system during regular service checks. Going on 2 years now without any related problems. The key was getting all plugs replaced at once rather than trying to fix just the failed ones. This keeps the electrical load balanced across the whole system.

After getting several recommendations here, I took my Touran to a certified diesel specialist. The initial diagnosis confirmed what many forum members suspected, multiple failing glow plugs causing the persistent warning lights. The total repair came to 380€, which included replacing all glow plugs, fixing some damaged wiring, and a full system diagnostic check. The mechanic did excellent work, no rough idle or engine misfire issues since the repair. The engine light disappeared immediately after the fix and cold starts are perfect now, even on chilly mornings. The whole job took about 3 hours and the improvement in engine performance was noticeable right away. Really glad I asked here first instead of going back to my previous mechanic. The specialist showed me the worn glow plugs and explained exactly what was causing the problem. My diesel engine is running better than it has in months. Thanks everyone for steering me in the right direction with this repair.