Re: FORD/FIESTA/1.4 ZETEC/2003 CAT EFFICIENCY & RUNNING LEAN ERRORS Archived Message
Posted by Alan Kane on June 8, 2008, 9:09 am, in reply to "FORD/FIESTA/1.4 ZETEC/2003 CAT EFFICIENCY & RUNNING LEAN ERRORS"
Hi George, Well done. Its nice to see some effort being applied to a post. From what you have posted it seems the front O2 sensor is working correctly. The low signal is backed up by the gas readings. So the ECU is responding to this signal and driving it rich. You need to find the source of this excess O2. I’m not familiar with this engine. Does it have a breather valve? I am thinking an internal leak. HTH Alan
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