GMtech1
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Thats a cylinder 3 misfire P0303 and the other code is a faulty Oxygen sensor
Does it missfire at all like does the truck have a jerking motion with white smoke coming out of ...
Check to make sure you dont have a blown fuse or a bad DRL relay if their good the its a ground i...
There is a problem with your reductant system (DEF) could be as simple as you are low on DEF flui...
If equipped with an EGR valve, remove the egr valve and clean it, ive seen it on isb cummins engi...
They are not tied together the change oil message means you need an oil change and the P0332 code...
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