DTC P1127:00 [MZI-3.7]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

DTC P1127:00	Exhaust temperature out of range, HO2S tests not completed
DETECTION CONDITION	The 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 CAUSE	Exhaust system too cool Engine not operating long enough prior to carrying out the KOER self-test