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

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

Description: The heated oxygen sensor (HO2S) monitor uses an exhaust temperature model to determine when the universal 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 before carrying out the key ON, engine running (KOER) self-test Exhaust system too cool
Diagnostic Aids: Monitor the universal 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
All	GO to Pinpoint Test DZ .