Possible Causes
- The powertrain control module has determined failures where some circuit quantity, reported via serial data, is below a specified range
- Heated oxygen sensor heater circuit short circuit to ground, open circuit, high resistance
- Exhaust gas temperature sensor post DPF circuit short circuit to ground, open circuit, high resistance
- Connector is disconnected, connector pin is backed out, connector pin corrosion
- Heated oxygen sensor failure
- Exhaust gas temperature sensor post DPF failure