Re: FORD/FIESTA/1.4 ZETEC/2003 CAT EFFICIENCY & RUNNING LEAN ERRORS Archived Message
Posted by Dave Harney on June 8, 2008, 6:53 pm, in reply to "Re: FORD/FIESTA/1.4 ZETEC/2003 CAT EFFICIENCY & RUNNING LEAN ERRORS"
Hi George, Have you checked the exhaust for leaks in front of the (pre) 02 sensor - this would make the 02 sensor report a lean mixture and the ECU to command a richer mixture ! This "richer" mixture that your seeing in the gas analysis wouldn't improve because of the leak affecting the 02 sensor. Regards Dave
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