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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. 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 
E-Series 4.6L,
E-Series 5.4L,
Expedition,
F-150,
Flex,
MKS,
Navigator,
Sable PZEV,
Taurus PZEV,
Taurus X
PZEV		 - GO to Pinpoint Test DZ . -
All others - GO to Pinpoint Test DW . -
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