PO171 - Lean Mixture Bank 1 Code???

[SteveLCetc]

I got this code. Twice now. The first time it was reading right at zero when it was idling while we were getting the number, but the max was 9.something.

Is there a common problem that causes this?

 

[SteveLCetc]

For some cloure on this, I went to the source. The probability was that the inlet air hose from the air cleaner to the manifold was cracked. That was in fact correct. It was broken between a couple of ribs - actually the two upstream ones. You had to look at it perpendicularly to see the crack.

I owe C-Dan a few beers for that one...