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What is causing decreasing fuel mileage in my.

Tiny
STUDEBAKER437
  • MEMBER
  • 2009 CHEVROLET COBALT
  • 30 MILES
What is causing decreasing fuel mileage in my xfe? I have proper tire pressure, clean air filter, and new spark plugs. Could it be an oxygen sensor or catalytic convertor clogging?
Sunday, January 8th, 2012 AT 11:32 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Check that the O2 sensor is working correctly, these can go out of calibration and send mixtures rich over a period of time, if it has never been replaced I would consider doing so, also a scan for any unresolved fault codes, start here.
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Monday, January 9th, 2012 AT 12:19 AM

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