Audi
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Heated oxygen sensor (HO2S) 1, Bank 1 & 2 - heater control - circuit high
Cause:
    Wiring short to positive, HO2S

Ford
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Lack of HO2S Switches, Sensor at Rich Limit Conditions
Cause:
    Engine running in closed loop, then the PCM detected that the HO2S-11 signal did not switch because the fuel control system is at its rich limit

Mazda
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Heated oxygen sensor (HO2S) rich mixture indicated
Cause:
    Wiring, HO2S, fuel pressure, fuel system, mechanical fault, ECM

Mercedes-Benz
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Heated oxygen sensor (HO2S) control 1 - system too rich
Cause:
    Intake/exhaust leak, HO2S

Nissan
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Intake manifold air control solenoid - circuit malfunction
Cause:
    Wiring, intake manifold air control solenoid, ECM

Saab
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Heated oxygen sensor (HO2S) 1, Bank 1 - malfunction
Cause:
    Wiring, HO2S, ECM

Subaru
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Heated oxygen sensor (HO2S) voltage low
Cause:
    Wiring, HO2S, ECM

Volkswagen
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Heated oxygen sensor (HO2S) heater control - circuit high
Cause:
    Wiring short to positive, HO2S