[Fly1ngSqu1rr3l]

Alright, I have at least a dozen gearheads scratching their heads on this one.

2007 BMW 335xi 4-door.
1 Owner

Scenario from this morning:
1. Drove my 335xi to the shop to upgrade my wheels.
2. ABS 4x4 warning light comes on with the new wheels.
3. BMW Dealership tells me that upgrading the wheels causes the X-Drive computer to fail, which can destroy the transfer case.
4. Shop puts factory wheels back on.
5. Drive home in the rain being reminded why I like AWD .
6. Wait for dealership review in the AM.

Hmm. From what I can tell, my transfer case was just waiting to fail on this car and the wheels have nothing to do with it Though the X-Drive could be picky, I doubt the answer is an E90 can't have 18" rims... Let's examine the facts.

1. Factory Wheels & Tires: BMW 17" Rims w/ 225/45R17 Tires.
2. New Wheels & Tires: VMR718 18" Rims w/ slight offset 225/40R18 (Front) and 255/35R18 (Rear).
3. BMW not only sold this car originally w/ an 18” rim option, they will *still* sell me 18” rims for my car.
4. Total difference between wheel/tire diameter before and after? 1/10th of an inch.
5. Hundreds of E90Post and Bimmerforums users w/ E90 X-Drive cars w/ 18" and 19" rims.

Anyone else have this problem? BMW Dealership is telling me that there is NO FIX, that putting the 18" rims will chronically cause the X-Drive computer to fail and destroy the transfer case.

That seems like a load of crap. If it's true, I'm selling her tomorrow /sniff.

Fine, maybe not, but I’m steaming mad. I even rage called the Audi dealership.

Code List:
• 51B0 – DSC Brake Light Switch/Brake Pressure
• 5462 – VTG Servomotor or coupling force too high
• 5463 – VTG Mechanism Malfunction
• 54C4 – VTG Calibration Faulty
• 55C3 – VTG Limp Home Mode Activated
• E104 - CAN low error