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computer reading p0171 error

jefg1110jefg1110 Member Posts: 1
edited May 2016 in Kia
I have changed the gas and air filter and the oxygen sensor and engine light still comes on.

When I changed the oxygen sensor, I noticed a crack in the manifold cover. Can this be the real cause of my problem? If now ANY SUGGESTIONS PLEASE HELP!!
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  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    yes it definitely could IF you could prove that that crack allowed for a vacuum leak. You could test this by a squirt of carb cleaner or propane. If engine idle increases, then you have a leak.

    Replacement of the 02 sensor is a very common misdiagnosis of the 171 and 174 codes.

    You might also have an issue with the MAF sensor, which can sometimes be successfully cleaned. Visit YouTube for a "How-To". Be sure to use the proper solvent ! !
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