Volvo AWD 850 Forum

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long term fuel trim errors 850 1996

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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long term fuel trim errors 850 1996

Do you mind telling us how much the dealer charge you for their diagnosis/repair? Thanks.








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long term fuel trim errors 850 1996

They charged one hour of labor and the part was about $75. After all was said and done, it cost about $160.







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