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Technical DescriptionLack of HO2S-21 Switch, Sensor Indicates Lean What does that mean?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. SymptomsYou will likely not notice any drivability problems. CausesA 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)
Possible Solutions
  • See the above list of causes and go from there.
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Q: What causes engine code P1151 in a 2002 Ford Taurus?
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