Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Ford Edge SE, 4WDFACTORY OEM SERVICE PROCEDURE
DTC P0140 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
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DTC DESCRIPTION P0140 - O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 2)
| Description: | The nitrogen oxides bank 1, sensor 2 (NOx12) module monitors the NOx12 sensor oxygen (O2) signal for a lack of movement concern. This DTC sets when the actual O2 signal value does not change from the default O2 signal value. | ||
| Possible Causes: |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST RD . | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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