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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 below normal operating temperature
Diagnostic Aids:  Monitor the HO2S heater PIDs to determine their ON/OFF state. DTC P1127 is present if the exhaust is below normal operating temperature.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST DZ .
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