P0140
O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
Severity: MEDIUM
Symptoms
- Unstable idle
- Increased fuel consumption
- Check Engine Light Illuminates
Causes
- Oxygen sensor malfunction
- Open or short circuit in wiring harness
- Poor contact in the sensor connector
- Power or grounding problems
How to Fix
- Check the status of the sensor and its connection
- Check the integrity of the wiring harness
- Measure the resistance and voltage at the sensor
- Replace sensor if necessary