Question about 2000 Ford Ranger SuperCab

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ODB-II Trouble Code of 1151

That is the problem. I am getting a ODB-II Trouble Code of 1151 on my 2000 Ford Ranger 4.0 Liter Pushrod vehicle the manual says it's a manufacturer specific code. I called Ford and they cannot tell me what it means.

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P1151-Lack of HO2S-21 Switch, Sensor Indicates Lean
A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

A code P1151 may mean that one or more of the following has happened:
Electrical:

  • Short to VPWR in the harness or HO2S
  • Water in the harness connector
  • Open/shorted HO2S circuit
  • Corrosion or poor mating terminals and wiring
  • Damaged HO2S
  • Damaged PCM
Fuel System:
  • Excessive fuel pressure
    Leaking/contaminated fuel injectors
    Leaking fuel pressure regulator
    Low fuel pressure or running out of fuel
    Vapor recovery system
Induction System:
  • Air leaks after the MAF
  • Vacuum Leaks
PCV system:
  • Improperly seated engine oil dipstick
EGR System:
  • Leaking gasket
  • Stuck EGR valve
  • Leaking diaphragm or EVR
Base Engine:
  • Oil overfill
  • Cam Timing
  • Cylinder compression
  • Exhaust leaks before or near the HO2S(s)
Do you have any running or driveability problem, with this code usually you will not, check these things and makes repairs as necessary, not all of these will be wrong but at least one may be wrong, let me know what you find, hope this helps

Posted on Jun 02, 2009

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