P1667 Cylinder Identification Circuit Malfunction

Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: F-250/F-350 Super Duty diesel, gas models with CID

What does P1667 mean on a Ford?

P1667 — Cylinder Identification Circuit Malfunction. This Ford-enhanced code applies to F-250/F-350 Super Duty diesel, gas models with CID.

Common causes of P1667

Failing CID sensor
Open or shorted CID circuit
Excessive sensor air gap
Damaged tone wheel
PCM input fault

How to fix P1667

Test CID signal during crank
Check the air gap
Inspect tone wheel condition
Verify circuit continuity
Replace the sensor if the signal is absent