2004 Chevy Tahoe po179

2004 CHEVROLET TAHOE
71,000 MILES • V8 • 4WD • AUTOMATIC
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PACO4111
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5.3 e85

Check engine light (po179)comes on intermittently,but stays on longer at times. I cant find anything on how to diagnose this code(FUEL COMPOSITION SENSOR).Where is this sensor located.
Apr 9, 2010 at 7:13 AM
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DOCFIXIT
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Hi FCS measures amount of ethanol in fuel. Must have a diagnostic scan tool to diagnose so trip to shop is needed. Located on frame need to remove transfere cover shield to acess.


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_441.jpg

Hope this helps Thanks for donate
Apr 9, 2010 at 8:38 AM