Chrysler
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    HO2S Shorted To Ground Conditions:
Cause:
    ECT sensor input more than 170°F on the previous key on cycle, cold engine startup completed (ECT sensor input under 90-98°F, BTS input reading ±59°F of ECT) or BTS within 27°F of the ECT input, then test started and the PCM detected that the rear HO2S-13 signal was less than 156 mv for 28 seconds after startup or prior to the 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 P0101, P0102, P0103, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0151, P0152, P0153, P0154, P0300, P1133, P1134, P1153 and P1154 not set, ECT input 179°F or more, in closed loop, HO2S ready for testing, engine speed over 800 rpm, MAP input over 32 kPa, throttle angle 5 4-25 degrees, these conditions met for 3 seconds, then the PCM detected that the HO2S-13 signal was lean (490 mv or less) for 100 out of 120 seconds