Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Mercury >> 2008 >> Sable Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Powertrain DTC Charts And Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> P1127 - Exhaust Temperature Out Of Range, O2 Sensor Tests Not Completed

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 
Sable PZEV,
Taurus PZEV,
Taurus X PZEV		   - refer to PINPOINT TEST DZ . -
All others   - refer to PINPOINT TEST DW . -
scientia non olet · About Mike's Workshop Manuals