Mechanics

EMISSION LIGHT

2007 Ford Fusion

Engine Performance problem
2007 Ford Fusion 4 cyl Front Wheel Drive Automatic 45800 miles

emission light is on and the vehicle has an erratic speedometer when decelerating and down shifts hard.
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Ameneses2004
April 1, 2010.




Have you had the computer scanned? As far as the speedo, it sounds like an issue with a vehicle speed sensor. However, I have seen the throttle position sensor cause ids a bad ISC Have you checked that?



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