Question about 1996 Ford F150 Regular Cab
Had the same problem with a Expedition...you can try cleaning the MAF, but also make sure your spark plugs are in good shape. The plugs on my 5.4 were all oil fouled and I had bank 1 and 2 lean codes (left and right cylinder heads)
Posted on Jul 16, 2009
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Posted on Jan 02, 2017
SOURCE: diagnostic code #'s p0174,p0171
oxygen sensors are telling you that the mixture is too poor on ur sistem need to check its behaviour and see whats causing that lean mixture
hoope this helps
Posted on Nov 10, 2009
SOURCE: engine check light on error code
P0171 system too lean bank 1
P0174 system too lean bank 2
links to information on the codes
it means that the O2 sensors in your vehicle detected a lean condition in their respective banks. this could be caused by a dirty MAF (mass air flow) sensor or a vacuum leak downstream from the MAF sensor
sometimes you can clean the MAF with electronics cleaner or brake cleaner but be sure to take it off the vehicle first. be careful not to damage the MAF while spraying the cleaner, and allow it to dry completely before installing it on the vehicle.
Posted on May 21, 2011
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