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DTC P1127: Exhaust Temperature Out Of Range, O2 Sensor Tests Not Completed

DTC P1127: EXHAUST TEMPERATURE OUT OF RANGE, O2 SENSOR TESTS NOT COMPLETED

Description:  The heated oxygen sensor (HO2S) monitor uses an exhaust temperature model to determine when the HO2S heaters are cycled ON. This DTC sets 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 the ON or OFF state. DTC P1127 is present if the exhaust is not hot.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Fiesta, Transit Connect GO to PINPOINT TEST DW .
All others GO to PINPOINT TEST DZ .
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