1. Engine
  2. Engine Controls - 3.4L (LA1)
  3. Diagnostic Information and Procedures
DTC P1133 HO2S Insufficient Switching Sensor 1

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    Circuit Description

    The PCM monitors the Heated Oxygen Sensor (HO2S) activity for 100 seconds. During this test period the PCM counts the number of times that the HO2S signal voltage crosses the rich to lean and lean to rich thresholds. If the PCM determines...

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    Service Manual Table of Contents

    Document Tags

    Document Title: DTC P1133 HO2S Insufficient Switching Sensor 1

    circuit

    heated

    oxygen

    sensor

    test

    signal

    voltage

    rich

    lean

    switch

    setting

    system

    heater

    dtcs

    present

    hos

    action

    malfunction

    consecutive

    diagnostic

    failed

    using

    scan

    tool

    ignition

    ground

    check

    connections

    vehicle

    condition

    value

    info

    specified

    monitor

    indicate

    exhaust

    found

    repair

    complete

    conditions present

    tool monitor

    tool indicate

    signal circuit

    action complete

    voltage changes than

    oxygen sensor replacement

    powertrain board diagnostic

    operate vehicle parameters

    vehicle parameters specified

    parameters specified conditions

    criteria diagnostic support

    scan tool monitor

    tool monitor specific

    test runs test

    runs test result

    scan tool indicate

    tool monitor hos

    monitor hos voltage

    hos voltage scan

    voltage scan tool

    tool indicate voltage

    indicate voltage specified

    repair open hos

    hos signal circuit

    repair procedures electrical

    diagnosis action complete