DTC Code P1131

Discussion in 'Engine & Performance' started by falcn, Jan 18, 2006.

  1. falcn

    falcn Member

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    Tonight when driving home from work my 1997 Expy Eddie Bauer with 5.4L check engine light came on.

    I noticed no change in performance - no shuddering, hesitation, etc.

    I went to Autozone and borrowed the code reader and the code pulled was P1131.

    Where would you start on the list below?

    Or should I just replace the HO2S-11 Oxygen sensor?


    We just got the vehicle on Dec. 1st - 73K miles on it now.

    This link shows:
    http://v8sho.com/SHO/TSB0197HO2SServiceTips.htm

    "P1131 - Lack of HO2S-11 Switch, Indicates Lean

    When an HO2S sensor indicates lean at the end of a test, the system is trying to correct for an over-lean condition. The code is set when the fuel control system no longer detects switching for a calibrated amount of time.

    See Possible Causes for DTC P1130"

    Possible Causes:

    Electrical:
    · Short to VPWR or VREF in harness or HO2S
    · HO2S circuit shorted to Ground
    · Water in harness connector
    · Open circuit
    · Corrosion or poor mating terminals and wiring
    · Damaged HO2S
    · Damaged PCM (other DTCs should be present)
    Fuel System:
    · Excessive fuel pressure (stuck fuel pressure regulator, restricted fuel return lines, etc.)
    · Leaking/contaminated fuel injectors or fuel pressure regulator
    · Low fuel pressure or running out of fuel (fuel pump concern, fuel supply line restrictions, low fuel level, etc.)
    · Vapor recovery system (stuck VMV, etc.)
    Induction System:
    · MAF contamination
    · Air leaks between MAF and throttle plate
    · PCV system / Other vacuum leaks
    · Improperly seated engine oil dipstick
    EGR System:
    · Leaking gasket
    · Stuck EGR valve / Leaking diaphragm or EVR
    Base Engine:
    · Oil overfill
    · Incorrect cylinder compression
    · Exhaust leaks before or near the HO2S
    · Secondary air stuck on
     
    Last edited: Jan 18, 2006
  2. JUST4FUN

    JUST4FUN Admin Staff Member

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    i would replace fuel filter first and go from there
     
  3. falcn

    falcn Member

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    I cleaned the MAF sensor wires - cleared the codes - no more CEL - and it is running better and gets better mileage.
     
  4. tarafied1

    tarafied1 Active Member

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    I know this is an old topic but I thought it would be good for those who are serching.
    I have had lots of codes recently on my 2000 EB with the 5.4 V8.
    I changed the DPFE sensor for insufficient flow at the EGR. It didn't help. I pulled the throttle body and intake and cleaned it, changed EGR and then got the p1131 code. I cleaned the MAF with some spray and have had no more issues.
     
  5. monicacorzo

    monicacorzo New Member

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    Expedition 03

    I have the same trouble with my expedition, I replaced the fuel pump and filter also the fuse box because the fuel pump relay inside wasn't working, runs better but still make like a little jump. Then I replace the spark plugs, coil boots they had rust and looks like tartar was building in... runs better but still does a little jump it feels less than before but I don't know what else to check still getting the same code P1131
     

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