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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 765 (Engine Controls - Powertrain DTC Charts & Description (Except Diesel & Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> DTC P1127: Exhaust Not Warm Enough, Downstream Sensor Not Tested

DTC P1127: Exhaust Not Warm Enough, Downstream Sensor Not Tested

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P1127 - EXHAUST NOT WARM ENOUGH, DOWNSTREAM SENSOR NOT TESTED

Description:  The heated oxygen sensor (HO2S) monitor uses an exhaust temperature model to determine when the HO2S heaters are cycled ON. The test fails when the inferred exhaust temperature is below a minimum calibrated value.
Possible Causes: 
  • Engine not operating long enough prior to carrying out the key on, engine running (KOER) self-test
  • Exhaust system too cool
Diagnostic Aids:  Monitor the HO2S heater PIDs to determine their ON/OFF state. DTC P1127 is present if the exhaust is not hot.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All - GO to H: Fuel Control STEP H59. -
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