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.
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HOMESERVICE MANUALSFORD2018FUSION PLATINUM HYBRIDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID))DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONSDTC P0140 - O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 2)
2018 Ford Fusion Platinum Hybrid
DTC P0140 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
2018 Ford Fusion Platinum HybridSECTION DTC P0140 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
WARNING: This page is about a different variant/trim than selected.
P0140 - O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 2)
| Description: | If the sensor signal value is not changing from the default value, the PCM commands an oscillating air to fuel ratio attempting to detect some movement in the signal value. This DTC sets when the PCM is unable to detect movement in the sensor signal while the air to fuel ratio is oscillating. | ||
| Possible Causes: |
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| Diagnostic Aids: | An O2S12 PID switching across 0.45 volt from 0.2 to 0.9 volts indicates a normal switching HO2S. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST DW . | ||
RENDER: 1.0x
NO RELATED
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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.