Trouble codes

Tiny
MARYDARLINE
  • MEMBER
  • 2002 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
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.
Tuesday, December 28th, 2010 AT 6:46 PM

1 Reply

Tiny
ERNEST CLARK
  • MECHANIC
  • 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).
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Tuesday, February 8th, 2011 AT 1:53 PM

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