Question about 1999 Ford F150 Regular Cab

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Fuel air metering p1131code

P1131

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P1131-Lack of HO2S-21 Switch, Sensor Indicates Lean- Bank 1
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 P1131 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)
Hope this helps, let me know

Posted on Jun 05, 2009

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P1131


Check Engine lights are the worst. The OBD2 code P1131 suggests a problem with the fuel air mixtures. Often though, the check engine alerts result from failing or faulty sensors rather than from what the sensor is suggesting. It is advisable to check the sensor first.
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Hi there:
DTC P1131 - HO2S Bank 1 Sensor 1 Signal Below 0.45v (A/F Ratio Too Lean)
Just check and clean harneses connections if not solve itr, replace O2 sensor.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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Code p1131 please help


P1131 - Lack Of HO2S Switch - Sensor Indicates Leanxicon.jpghttp://engine-codes.com/p1131.htmlForum CodePossible causes- Vacuum leak affecting bank 1 only
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' var HIGHmap155714728 = '' // --> 155714728


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' var HIGHmap155714613 = '' // --> 155714613

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