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 MANUALSFORD2009FUSION SEL, 3.0 1, FWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P1647: - LINEAR O2 SENSOR CONTROL CHIP (BANK 2)
2009 Ford Fusion SEL, 3.0 1, FWD
DTC P1647: - Linear O2 Sensor Control Chip (Bank 2)
2009 Ford Fusion SEL, 3.0 1, FWDSECTION DTC P1647: - Linear O2 Sensor Control Chip (Bank 2)
DTC P1647: - LINEAR O2 SENSOR CONTROL CHIP (BANK 2)
| Description: | See the description for DTC P1646. | ||
| Possible Causes: | See the possible causes for DTC P1646. | ||
| Diagnostic Aids: | See the diagnostic aids for DTC P1646. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | Reprogram or update the calibration. Check for other DTCs and diagnose those first. Make sure to check for aftermarket performance products before installing a new PCM. Clear the DTCs, repeat the self-test. If the DTC is retrieved again, install a new PCM. Reprogram the FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . | ||
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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.