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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 P0040, P0041 >> Notes

DTC P0040, P0041: Notes

DTC P0040, P0041 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0040 P0040: Front HO2S (LH/RH) signals swapped
DTC P0041 P0041: Rear HO2S (LH/RH) signals swapped
DETECTION CONDITION 
  • P0040 indicates that during KOER testing, the front HO2S signal(s) response for a fuel shift to the correct engine bank was not indicated.
  • P0041 indicates that during KOER testing, the rear HO2S signal(s) response for a fuel shift to the correct engine bank was not indicated.
POSSIBLE CAUSE 
  • Crossed HO2S harness connectors.
  • Crossed wiring at HO2S harness connectors.
  • Crossed wiring at PCM harness connector.
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