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Message: <blockquote data-quote="Teezbeez" data-source="post: 22382" data-attributes="member: 8313">Hi. I've got an o8 Equinox LTZ. Had the same problem with the Bank I System Too Lean. I was thinking I'd check for vacuum leaks first. Remembered that I had just changes the EGR Valve. Went and checked that out. It wasn't really tightened up very well. Tightened it up and voila no more P0171. No idea if that's what the problem was. But it solved the problem.</blockquote>