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I have a 2001 Ford Taurus. The check engine light came on and it said it was the EGR valve sensor. Replaced both of the sensors. Now the light comes on and it keeps giving me the codes P0171 and P0174 which telss me it is running too lean in Banks 1 and 2. I replaced all 4 Oxygen sensors and the light still keeps coming on.
I have checked for vacuum leaks and have not found any. I am at my wits end. Have no idea what would cause this. Would appreciate any help I can get.
I have a '98 Olds Regency. The two times that the "Check Engine" light came on the jerks at the "service" station overfilled the crankcase. They put in 5 qt. when it only takes 4 1/2.
The extra oil gets whipped up by the crankshaft which causes the O2 sensor to sense the oil vapors coming through the system.
Just my 2 cents worth.
Joe, since the third digit--"1", indicates it's an air/fuel code, would a faulty KS or it's circuit cause a "1" code? I'd think the computer would react to both banks of cylinders always being lean by correcting the fuel trim towards the richer side. Is it possible that a MAP or BARO sensor could be sending a false signal without setting a code, and trimming the fuel to lean condition?
That's very possible, but I'm just going on having so many knock sensors go bad and give the same symptoms. It was just a suggestion and I would be testing components before replacing them.
This car doesn't use a knock sensor. It doesn't use a map sensor. Fords that have fuel trim codes get a fuel filter, a fuel pressure check and the MAF sensor gets cleaned. Takes care of the lean codes about 98% of the time
The knock sensor on a 2001 Ford Taurus is on the left side of the engine. Part number is YF1Z12A699AA. But don't go out and buy one until you have it tested first.
email Earl Reinhart
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