Chrysler
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    HO2S Shorted to Voltage Conditions
Cause:
    Engine runtime 2-4 minutes, ECT sensor input from 176-180-F, then the test started and the PCM detected the rear HO2S-13 signal was more than 1.2-1.5v (condition met for over 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 or TCM codes set, in closed loop, then the PCM detected the HO2S-13 signal remained over 999 mv, or in Decel Fuel Mode, voltage remained over 200 mv for up to 105 seconds