Posted by Aidan Birley on December 31, 2010, 8:45 am, in reply to "ford fiesta po131 "✏️ Message modified by board administrator January 2, 2011, 1:20 pm
hi
The 400 mv could have been a default ECU value when current fault logged for o2 sensor.
I would check fuel trims next for any clues, freeze frame and current values.
Cheers Aidan
Message Thread 
Ford Fiesta 1.6 16v 2002 - Fault code P0131 # - Phil Kingdon December 30, 2010, 10:01 pm
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