[MarkR171]

My car has been at the dealer for a week now. I first got limp mode on the highway last week, power reduced, etc. Stopped the engine, waited a few minutes and started again, limp mode gone. I drove around the parking lot for a few minutes and limp mode came back again so I took the car to the dealer.

Dealer runs codes, sees that VANOS timing is off. They find a "sheared off / broken bolt in the exhaust side of VANOS." As of today, they replaced the exhaust VANOS (so far $2700 out of warranty.) My SA says the car sounds better at idle (was ticking bad when I first took it in) but the computer still says "VANOS is not activating."

Now they want to replace the intake VANOS and tensioner for another $2000, $4700 plus tax total so far.

All this after PROcede on Map 1 auto tune driven normally on the road with no other mods... How can a bolt just snap like that? I'm looking at $5000+ out of pocket and no car for two weeks on a 2011 135i with 20,000 miles on it...

Anyone with a tuned N55, please be careful....