I have a 2ltr tdi (mk1) the light was on indicating that my glow plug was needing changed (light goes out after driving for a while). So as I was going away to visit parents, and things were hectic thought I would drop the Zaf off at dealers (simplicity).
Anyway when on holiday I noticed there was an oil leak coming from the charge air pipe, took the pipe off to discover there was no o ring to seal the metal flanges together.
I replaced the o ring, and called the dealer in question to ask why they missed such a elementry point, (rule one metal to metal and some oil will 99.9% of the time leak). They said to bring it in and they would invistigate. But the assured me the the put a o ring in
Investigate what, makes me wonder if you went in to get your brakes done they might forget to refit a wheel.