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 P1646 - LINEAR O2 SENSOR CONTROL CHIP (BANK 1)
2018 Ford Fusion Platinum Hybrid
DTC P1646 - Linear O2 Sensor Control Chip (Bank 1)
2018 Ford Fusion Platinum HybridSECTION DTC P1646 - Linear O2 Sensor Control Chip (Bank 1)
WARNING: This page is about a different variant/trim than selected.
P1646 - LINEAR O2 SENSOR CONTROL CHIP (BANK 1)
| Description: | The PCM monitors the application specific integrated circuit that controls and monitors the universal heated oxygen sensor bank 1, sensor 1 (HO2S11). This DTC sets when the PCM detects an internal circuit or communication concern. | ||
| Possible Causes: |
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| Diagnostic Aids: | Check for other DTCs and diagnose those first. Check for intermittent universal HO2S wiring concerns. Check the universal HO2S wiring between the PCM and the sensor for damage. Check for aftermarket performance products. Reprogram or update the calibration. Clear the DTCs, repeat the self-test. If the DTC is retrieved again, install a new PCM. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | Refer to the Description, Possible Causes and Diagnostic Aids for the DTC. | ||
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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.