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I have a 2004 8.1 Silverado with po171 n po174 Can these codes be caused by bad O2 sensors? The only thing I have added is a 4inch cai and exhaust. Also could a tune fix this? For the cost of o2 sensors I can could damn near get efilive for my truck.
1 last thing the truck runs good no hesitation or anything.
 
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