P1647 Linear O2 Sensor Control Chip Bank 2

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: Ford models with wideband linear O2 sensors

What does P1647 mean on a Ford?

P1647 — Linear O2 Sensor Control Chip Bank 2. This Ford-enhanced code applies to Ford models with wideband linear O2 sensors.

Common causes of P1647

Failed bank 2 control chip
Circuit fault to the chip
Contaminated bank 2 sensor
Voltage fault
PCM fault

How to fix P1647

Check system voltage
Test the bank 2 wideband sensor
Inspect chip wiring
Compare banks
Replace the sensor assembly per tests