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Obd2 not powering

Chevrolet Silverado 2003 Extended cab 5.3l 4x4 180112 miles
My diagnostic Obd2 has no power. What is the fuse labeled ? Where is it?
Pauly from United States 10 months ago  
PA
7 reports 

Engine light comes on at 75 mpg, doesnot run rough

Chevrolet Silverado 2006 pick up  65000 miles
The light comes on at 75 mpd, code P0300, changed wires, air filter, added fuel injector cleaner(twice), runs fine, no change in performance. What else should I do? or not worry about it?
Kurt from United States 8 years ago  
KU
8 reports 
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