DTC P0040 BMW
O2 Sensor Signals Swapped (Bank 1 Sensor 1 Bank 2 Sensor 1)
O2 Sensor Signals Swapped (Bank 1 Sensor 1 Bank 2 Sensor 1)
Description
Engine started, battery voltage must be at least 11.5v, all electrical components must be off, the ground between the engine and the chassis must be well connected, the exhaust system must be properly sealed between the catalytic converter and the cylinde
Cause and Solution
HO2S-11 and HO2S-21 harness connectors are swapped
HO2S-11 and HO2S-21 wiring is crossed inside the harness
HO2S-11 and HO2S-21 wires are crossed at 104-pin connector
Video Guide
Diagnostic Info
- DTC Code: P0040
- Brand: BMW