DTC P0140-23: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2) - Signal stuck low: Action
- Check heated oxygen sensor rear is correctly installed on catalyst
- Refer to the appropriate system wiring diagrams and check the heated oxygen sensor rear circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- Check for air leakage between catalyst and exhaust manifold flange
- Check heated oxygen sensor rear for tip contamination by excessive oil consumption. Carry out oil consumption check
- Check heated oxygen sensor rear for tip contamination by poor or incorrect fuel. Check customer is using correct grade of fuel
- Check and install new heated oxygen sensor rear as required