Ford Codes List

Ford-enhanced trouble code lookup
for Ford, Lincoln and Mercury.

Repair Order

655 Ford-enhanced codes on file

Code
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
Related
No single generic twin. See OBD Codes List

Findings, check these first

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

Standard procedure

  1. Check system voltage
  2. Test the bank 2 wideband sensor
  3. Inspect chip wiring
  4. Compare banks
  5. Replace the sensor assembly per tests

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

Review: checked against the recorded source material.

  • OBDII.pro: P1647 Ford definition

    live reference page (obdii.pro)

    Supports: Ford-family meaning for P1647: LINEAR O2 SENSOR CONTROL CHIP (Bank 2)

    Fetched directly. obdii.pro is a publisher independent of the engine-codes family.

  • P1647 FORD Code: Meaning, Causes, and Symptoms | OBD2 Codes

    live reference page (obd2-codes.co)

    Supports: Ford meaning for P1647: Linear O2 Sensor Control Chip Bank 2

    Fetched directly. obd2-codes.co phrasing matches the engine-codes family, so it counts as one publisher.

Last updated 2026-09-06.

Report a correction for P1647. Include your vehicle, the issue and a source if you have one.

This fault is part of the Ford fuel and ignition codes guide. It covers the family and the order to check it.

Related Fuel/Air Metering codes