Possible causes

– Camshaft timing incorrect
– Variable Camshaft Timing solenoid stuck open

Tech notes

There is factory service bulletin for the following Ford Models:

2002 Ford Focus
2003 Ford Focus
2002-2003 Ford Focus Factory Service Bulletin OBDII code P0012

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Possible Lack/Loss of power
– Possible Engine rough idle

P0012 FORD Description

The ECM has detected the VCT position in an over retarded condition- Camshaft timing retarded

FORD Technical Service Bulletins for P0012 code