I just purchased a '97 Jimmy with an engine light on at all times.I
did a scan of the codes and came up with a 0140 (O2 Sensor Circuit No
Activity Detected) and a 0719 (Torque Converter/Brake Switch B Circuit
Low). Does anyone know what could be causing these faults? (I am
assuming the first is simply the O2 sensor) Any help or suggestions
would be appreciated. Thanks!