Chrysler
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    HO2S Shorted To Ground Conditions
Cause:
    Key off, engine cool-down period completed, then the test started and PCM detected the rear HO2S-22 signal was below 156 mv prior to the start of HO2S-22 heater test.

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

GM
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    HO2S Circuit Low Input Conditions
Cause:
    DTC P0100, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0125, P0151, P0200, P0372 and P1351 not set ECT sensor input more than 118°F, AIR and Catalyst Tests not active, throttle angle 3-20%, system in closed loop, A/F ratio at 14.6-14.8, then the PCM detected that the HO2S-22 signal was below 39 mv for 38 seconds