2004 Tahoe 24600 on it 5.3 keep geting a po300 code. New spark plugs new wires and coil packs. I think the after market cat is no good put it on 3 yrs ago I was getting. A po420 a long time go i did here sometime rattle in there a long time ago. With the live data look like the 02 sensor...
hi every one if you run into a proplem with your truck not starting and you have to by pass with a wire from the starter relay to the battery then you see the abs and 4 wheel drive light and a po740 code pops up and the transmission wont move check the 40 amp fuse for the IGN A and B...
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