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long term fuel trim errors 850 1996

posted by  someone claiming to be jlobito on  Fri Oct 15 14:08 CST 2004 [RELATED]

This is possibly helpful info for others. I was getting recurring check engine lights for a few weeks. PO171 and P0172 error codes. Those are long term fuel trim too lean/rich errors. After changing out the vacuum elbows and soft vacuum lines, checking O2 sensor outputs, checking the MAF sensor output, and doing a thorough tune-up, I gave up and took it to a dealership. They found a hidden hole in one of the turbo air hoses. Why didn't I think of that???






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