Renew the alternator .a diode has failed or the regulator .
SOURCE: 2000 chevy 1500 truck stuck in 4-wheel drive
the shifter accuator or the wires going to it on the transfercase..gl
SOURCE: replace oxygen sensor on 2003 chevy silverado truck
it's not hard to change, kinda like a sparkplug with a wire permenantly attached, if you go to O'reilly's or Autozone they will loan you a special socket to take it off and install the new one, Generally most cars have two one before and one after the catylitic converter, make sure which one the code is telling you is bad. Also a cheap fix, many wrecking yards don't charge but 5 to ten bucks for a used one as opposed to a new one for 60.00 to 100.00, If you don't mind going out and removing it, You take a chance one getting a bad one but, you can always take it back and get another one
SOURCE: NEED DIAGRAM OF 2003 CHEVY SILVERADO TRUCK EXT
fuel pump is on the engine or either in the gastank follow the fuel line chevys are the easiest auto to work on a new i think yours is in your tank remove both straps and remove hose to filler neck. the fuel **** is in the center of th tank removed by a lock washer system holding the pump in also be careful that you follow the fuel lines though and that you remove bolts that hold the fuel ine to the frame and up to the engine or fuel filter then engine an up to the carb that way you can lower tank without bending fuel line any way however you took it off put it back if a human put this thing together then a human can fix it
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