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

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

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		-	refer to PINPOINT TEST DW .	-