DTC P2271:00, P2273:00 [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 P2271:00 |
P2271:00: HO2S (RH) signal stuck rich |
| DTC P2273:00 |
P2273:00: HO2S (LH) signal stuck rich |
| DETECTION CONDITION |
- P2271:00 indicates that HO2S (RH) signal is stuck rich
- P2273:00 indicates that HO2S (LH) signal is stuck rich
- The downstream HO2S is forced lean 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 |
Electrical System:
- P2271:00: Short to ground between HO2S (RH) terminal B and PCM terminal 3Z
- P2273:00: Short to ground between HO2S (LH) terminal B and PCM terminal 3AB
- HO2S signal circuit short to other HO2S harness
- P2271:00: Short to power supply between HO2S (RH) terminal B and PCM terminal 3Z
- P2273:00: Short to power supply between HO2S (LH) terminal B and PCM terminal 3AB
- HO2S malfunction
- PCM malfunction
Intake Air System:
- Air leaks
- Vacuum leaks
- PCV system malfunction
- Incorrectly seated engine oil dipstick, tube or oil filler cap
Base Engine:
- Exhaust leaks (flange, gaskets)
|
 Courtesy of MAZDA MOTORS CORP.
|