The p0172 is due to an O2 sensor in the exhaust seeing too much oxygen, the po300 is a missfire present and p0304 is cylinder #4 missfire, check plug and wire to #4 and repair, this should also take care of the p0172, if a cylinder is missing it is just pump air into the exhaust thus causing the code p0172.
SOURCE: 2004 Dodge RAM 1500 HEMI 5.7 Engine Light
take it to autozone they will check why the light is on for free
SOURCE: belt diagram 2004 5.7 liter engine dodge ram 1500 1/2 ton 4x4
click on this link, and scroll down to 5.7L
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800ba71e
SOURCE: Dodge Ram 1500 can it have a plow?
if you do it do it at the dealer that you got it from so it wont void the warranty. that way you keep it in place and they can also tell you the specifications as to what you need to do ,if anything to the front of the truck
SOURCE: Need diagram to install serpentine belt on 2004
There should be a diagram under the hood on the fan shroud or radiator support. If not, let me know and I see if I can find one. For the most part, if the pulleys it rides on are grooved, the belt ribs ride on it, it the pulley is smooth, the back side rides on it. From a picture of the alternator I have, from the passenger side coming up, over the alternator, then down and under the belt tensioner (smooth pulley), then up and over A/C compressor, then down and around P/S pump, up and around water pump, down around crankshaft pulley.
SOURCE: When is it time to tune-up a 2004 Dodge Ram 1500
30,000 mile plugs but it doesn't meen they need replacement I work for chrysler I would wait till about 50 or 60 thousand remeber just because there is not a problem doesn't meen they should not be replace at the recommened intervals. they are considered a wearable item. when you do the plug do the wires. words of advise when doing the ignition wires do ONE WIRE AT A TIME it will save u from a big headache. Good luck.
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