Ford fault codes

413 Ford OBD-II fault codes: what each one means, and how to track it down.

How to read a code

P: SystemPowertrain
0: Defined bySAE, the same on every car
4: AreaAuxiliary emission controls
20: FaultThe specific fault in that area

Read the code
Note every stored and pending code your scanner shows, such as P0420.
Find it
Search by code or by words. For a manufacturer code (P1, B1, C1, U1) pick your make: its meaning differs by make.
Open the code
Its page explains the symptoms, likely causes, the checks to run and the fixes.