DTC P0040:00, P0041:00 [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 P0040:00 |
P0040:00: A/F sensor (LH/RH) signals swapped |
| DTC P0041:00 |
P0041:00: HO2S (LH/RH) signals swapped |
| DETECTION CONDITION |
- P0040:00 indicates that during KOER testing, the A/F sensor monitor determines if the A/F sensor signal response for a fuel shift corresponds to the correct engine bank. The test fails when there is no response from the A/F sensor being tested.
- P0041 indicates that during KOER testing, the HO2S monitor determines if the HO2S signal response for a fuel shift corresponds to the correct engine bank. The test fails when there is no response from the HO2S being tested.
|
| POSSIBLE CAUSE |
- P0040:00: Crossed A/F sensor harness connectors.
- P0040:00. Crossed wiring at A/F sensor harness connectors.
- P0041:00. Crossed HO2S harness connectors.
- P0041:00: Crossed wiring at HO2S harness connectors.
- Crossed wiring at PCM harness connector.
- PCM malfunction
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