2004 Ford Focus 2004 1.8 16v zetec Fault code P1131

Ford Focus Problem
The Problem

Fault code P1131
Jul 3, 2018 (1 year ago)
Have changed oxygen sensor up stream of cat replaced inlet manifold due to having a crack in it clear fault from ecu car runs fine for about 20 miles then the same fault returns any suggestions would be most welcome

Car details
Car: Ford Focus
Variant: 2004 1.8 16v zetec
Model Year: 2004
Category: Running Rough, Starting & Power Loss

Recalls: Ford Focus Recalls
More: Ford Focus Problems
Replies and solutions
Fixes: 12,347
Jul 3, 2018 (1 year ago)
Check the PCV valve and hose .
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