O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2

Where it lives

For P0140, the sensor sits on the circuit this code reports. The description of P0140 puts it on bank 1.

Check these first

• A failed downstream oxygen sensor on bank 1
• An open signal wire on the bank 1 sensor 2 circuit
• An exhaust leak at sensor 2 on bank 1
• A contaminated oxygen sensor
• A faulty ECM input

What to do next

1. Watch bank 1 sensor 2 on a scan tool for any switching
2. Test the bank 1 sensor 2 signal wire for an open
3. Check for an exhaust leak at sensor 2
4. Replace bank 1 sensor 2
5. Verify the ECM if the sensor is good
6. Clear the code and retest

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