AbbyGross
Touran Diesel 2003: Engine light on, black smoke and problems with the filament bulb
DPF regeneration failure
Longer cold start time
Pre-glow light won't turn off
Check engine light on
Black smoke from exhaust on acceleration
(Translated from German)
4 comment(s)
MargoRider
Hey, of course I remember the costs. I was lucky and the mechanic fixed the problem with the pre-glow relay. It cost €280, but since then it's been fault-free and I've had no more trouble - a real relief! No further problems have arisen so far, so everything seems to be in order. Hope that helps you, buddy! Keep at it and don't let it get you down!
(Translated from German)
AbbyGross (Author)
Hey, I also had a 2006 diesel VW Tiguan. Your symptoms remind me of what went wrong back then. In my case it was the DPF, totally blocked. Then there were the glow plugs that gave up. What a mess, I tell you. I had it done at the garage, luckily they're clever and know what they're doing. So it was also to do with the pre-glow relay, as you suspect, and the DPF. Hope that helps you a bit. Take care!
(Translated from German)