id like to know if a faulty gas cap would cause trouble codes po 171 and 174.when i bought this vehicle the check engine light came on shortly after. i took it to the place of purchace and told them the first code which said loose cap or canister cover.they said it was probably a bad gas cap .know it shows these two new codes which says its burning lean in bank 1 and bank 2 thanks for any info
trouble codes on 2001 Ford Explorer
by jimbo63 in Canton, ME on August 31, 2009
3 answers 1 comment
ANSWER by Bret Bodas on August 31, 2009
Here is some info about these codes: http://repairpal.com/OBD-Code-P0171-and-P0174
COMMENT by Visitor on November 22, 2010
The link here does not work. I have this persistent 171 and 174 code. Have done the fuel pump, fuel pressure reg, new 02's, cats, new maf, fuel filter. Still throwing codes...help!
ANSWER by hammerken on February 15, 2010
i would say intake o rings or fuel pressure. check fuel pressure with gauge if good do o rings first
ANSWER by Visitor on March 22, 2011
A faulty gas cap will not cause a P0171 or P0174 code. A faulty gas cap would cause an evaporative emissions code, possibly P0442 or P0446. Your 171 and 174 codes indicate a lean fuel mixture in the engine, possibly caused by a vacuum leak (intake gaskets or PCV system or broken vacuum hose), a weak fuel pump or restricted fuel filter or weak fuel pressure regulator, or a dirty/defective Mass Air Flow sensor. Also, double check the ductwork between the MAF sensor and the intake throttle body.
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