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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 P2271, P2273 >> Notes

DTC P2271, P2273: Notes

DTC P2271, P2273 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES

DTC P2271 P2271: Rear HO2S (RH) signal stuck rich
DTC P2273 P2273: Rear HO2S (LH) signal stuck rich
DETECTION CONDITION 
  • The downstream HO2S is forced rich and monitored by the PCM. The test fails if the PCM does not detect the output of the HO2S in a calibrated amount of time.
POSSIBLE CAUSE 
  • Rear HO2S malfunction
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