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

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 
Edge,
Escape/Mariner 2.5L Automatic Transmission,
Escape/Mariner
3.0L,
E-Series 4.6L,
E-Series 5.4L,
Expedition,
Explorer,
F-150,
Flex,
F-Series Super Duty,
Fusion 2.5L,
Fusion 3.0L,
Milan,
MKS,
MKT,
MKX,
Mustang,
Navigator,
Taurus		 GO to PINPOINT TEST DZ .
All others GO to PINPOINT TEST DW .
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