DTC P0031 BMW
HO2S Heater (Bank 1 Sensor 1) Circuit Low Input
HO2S Heater (Bank 1 Sensor 1) Circuit Low Input
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 is contaminated (due to presence of silicone in fuel)
HO2S signal and ground circuit wires crossed in wiring harness
HO2S signal circuit is shorted to sensor or chassis ground
Video Guide
Diagnostic Info
- DTC Code: P0031
- Brand: BMW