P1646 2011 FORD FUSION - Linear O2 Sensor Control Chip Bank 1
- Faulty Powertrain Control Module (PCM)
Tech notesReprogram or update PCM. Check for other DTCs and diagnose those first. Make sure to check for aftermarket performance products before installing a new PCM
- Engine Light ON (or Service Engine Soon Warning Light)
P1646 2011 Ford Fusion DescriptionThe Powertrain Control Module (PCM) monitors the application-specific integrated circuit that controls and monitors the Heated Oxygen Sensor (HO2S). The test fails when the PCM detects an internal circuit or communication concern.
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