OBDII Code List
P1646 2011 FORD FUSION

P1646 2011 FORD FUSION - Linear O2 Sensor Control Chip Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Powertrain Control Module (PCM)

Tech notes

Reprogram or update PCM. Check for other DTCs and diagnose those first. Make sure to check for aftermarket performance products before installing a new PCM

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1646 2011 Ford Fusion Description

The 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.
OBDII Code P1646 2011 Ford Fusion - Linear O2 Sensor Control Chip Bank 1 -

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