Check light came on after putting on 20's ?
 

Anyway to know why the check light is on or is that a dealer only diagnostic?

It should go away...

What check light. Do you meanthe check engine. what does it say. When i put my 20s on nothing happened

the check engine lamp should not come on after simply replacing the wheels, the abs/dsc lamp sometimes illuminates which is sometimes resolved by simply turning the steering wheel from lock to lock.

Same with my 22's. :dunno:

Turns out the right rear tire pressure was lower than the rest...I am such a dope somtimes...it was the tire pressure monitor light (banging head now against wall for such a stupid post sorry guys! ) :banghead:

At least it wasnt a real problem

Tony what PSI did you run on the style 87 20's ?
I have 37 all around now and it seems ok.