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1998 mercury sable codes

Took car to auto zone got 5 different codes PO761, PO171,172.174, 175 can someone tell me what they mean so i won't get screwed by a mechanic. Also my car every 3 or 4 days will not go no matter how much I press the gas pedal, not until I turn it off for a few minutes and start it back up will it go. It never kills just won't go.

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P0171, P0172 are bank one and two running lean which means not enough fuel, P0174 and 175 are bank one and two running rich which means getting too much fuel it sounds like a Mass Air Flow sensor issue or a computer issue and P0761 is a Transmission Shift Solenoid issue which could be an internal transmission problem and electrical problem or a computer problem

Posted on Apr 14, 2009


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Well this one will be a tough one.
P0761 is shift solenoid 3 malfunction. Most likely caused by a broken valve retainer in the valve body.
The other four codes well that may be tough to diagnose. See P0171 and P0174 are bank 1 and 2 are lean and
P0172 and P0175 are bank 1 and 2 are rich.
To have both banks coding rich and lean would be extremely rare.
I suspect you have a couple of problems like may be a MAF sensor problem, a vacuum leak, and maybe a restriction in the exhaust.
The exhaust restriction would be easy to diagnose. You would need a vacuum pressure gage and hook it into the hoses from the DPFE sensor. You should have 1PSI or less at idle and 3-4 PSI at wide open throttle anything more would be a restriction.

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