P0140
O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 is an OBD-II diagnostic trouble code meaning: O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2. Common causes: oxygen sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $33–78.
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
Related codes
Error P0140 by Vehicle Brand
FAQ
What does the P0140 code mean?
P0140 is an OBD-II diagnostic trouble code that indicates: O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
What causes a P0140 error code?
The most common causes of P0140 include: Oxygen sensor malfunction; Open or short circuit in wiring harness; Poor contact in the sensor connector; Power or grounding problems.
How do I fix a P0140 diagnostic trouble code?
To fix P0140: Check the status of the sensor and its connection. Check the integrity of the wiring harness. Measure the resistance and voltage at the sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0140?
Limited driving only, diagnose soon
How much does it cost to fix P0140?
The estimated repair cost for P0140 is $33–78. Actual cost depends on your vehicle, location, and labor rates.
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