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Home >> Mazda >> 2007 >> CX-9 Touring, 3.5 C, AWD >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System MZI-3.5) >> DTC P1127 >> Notes
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DTC P1127: Notes

DTC P1127 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES

DTC P1127 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 
  • Engine not operating long enough prior to carrying out the KOER self-test
  • Exhaust system too cool
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