P0140 Fault Code
P0140 OBD-II Trouble Code Short Description
O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
What does trouble code P0140 mean?
The P0140 code indicates that the engine control module (ECM) has detected a problem with the oxygen sensor circuit for Bank 2 Sensor 2. This sensor is responsible for monitoring the oxygen levels in the exhaust and is vital for maintaining optimal air-fuel ratios. A No Activity Detected fault suggests that the ECM is not receiving signals from the sensor as expected.
Symptoms
What are the symptoms of the P0140 code?
- Illuminated check engine light
- Decreased fuel efficiency due to improper air-fuel mixture
- Rough engine idle
- Increased emissions during inspection
- Failed emissions test
Causes
What causes the P0140 code?
- Damaged or corroded wiring in the oxygen sensor circuit
- Faulty oxygen sensor itself
- Poor connection at the sensor or the ECM
- Issues with the exhaust system, such as leaks
- Malfunctioning ECM
Possible Solutions
How to fix P0140?
- Inspect and repair wiring and connectors in the oxygen sensor circuit
- Replace the faulty oxygen sensor
- Check for exhaust leaks and repair if found
- Clear the fault code and test drive the vehicle to see if the issue persists