trouble codes

2002 FORD F-150
100,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MARYDARLINE
  • MEMBER
  • 10 POSTS
what is a HEGO sensor? If this is bad would it cause a PO171,174, 1131, 1151 codes to come up? We have tried everything but can't seem to find the problem. We get the codes cleared after replacing the MAF , the Intake gasket, and all 4 O2 sensors. the truck still runs like a top no problems just this irritating "ck engine soon" light. PLEASE help.
Dec 28, 2010 at 6:46 PM
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ERNEST CLARK
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 1,730 POSTS
P0171-P0174= Bank 1-2 lean. This either means there's some problem causing a lean air/fuel mixture, or the wiring/computer has problems. (since you've already changed sensors)

P01131-P01151= means the computer is correcting (making rich) the lean air/fuel mixture on bank 1-2. This will be due to the same problem as above.

Since you've already replaced MAF, check the wiring harness from O2 sensors. Then check your injectors for spray pattern (clogs).
Feb 8, 2011 at 1:53 PM
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