Chrysler
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    HO2S Short to Voltage Conditions
Cause:
    Engine runtime over 2 minutes, ECT sensor input more than 176°F, then the test started and the PCM detected the front HO2S-12 signal was more than 1.2v (condition met for 3 seconds)

Generic
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    O2 Sensor Circuit High Voltage

GM
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    HO2S Circuit High Input Conditions
Cause:
    No PCM codes set, engine running in closed loop, throttle angle from 2-40%, all conditions met for 4.5 minutes, then the PCM detected the Bank 1 HO2S-12 signal remained over 900 mv.

Nissan
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Heated oxygen sensor (HO2S) 2, Bank 1 - voltage high
Cause:
    Wiring, HO2S, fuel/intake system, injector, ECM