P1900 Output Shaft Speed Circuit Intermittent Malfunction

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: F-150, Explorer, Ranger

What does P1900 mean on a Ford?

P1900 — Output Shaft Speed Circuit Intermittent Malfunction. This Ford-enhanced code applies to F-150, Explorer, Ranger.

Common causes of P1900

Intermittent output speed sensor
Loose OSS connector
Chafed OSS harness
Cracked exciter ring
Corroded splice

How to fix P1900

Graph OSS for dropouts on a road test
Wiggle-test the harness
Inspect the exciter ring
Check splices
Replace the sensor if dropouts persist