Driving down the road, no symptoms, nothing wrong. The Check Engine light comes on. I take it to a local parts store and they read out code P0170. A local shop wants $100 just for a diagnostic, I haven't even asked the dealer yet.

The car runs fine, but I'm due for the state inspection this month and I can't pass with that light on.

Any likely causes for a "fuel trim" fault without any driveability problems?

David Bunin