went to autozone to get a scan on 1997 e420....3 fault codes were found...
p0302- defenition...cylinder misfire deteced-cyclinder number 2
probable cause: ignition system fault-spark plugs, vaccum leak injector fault, high or low fuel pressure

p0300-defenition: cylinder misfire detected probable causes Ignition system fault-spark plugs ignitionwires, coil, vacuum leak, injecore fault, high or low furel pressure..

p0455 definition EVAP large leak detected, Defective, loose or missing fuel cap EVAP canister broke, hose crakced or not connected, purge or vent solanoid defective, vacuum leak at engine..


Can someone help me estimate the cost on this...I would really appreciate this....I just wanta know how much of a dent it would put on my wallet...thanx in advance...

the P0455 code I was getting on my '97 E320 was cured by putting a shot of WD40 into both ends of the purge valve which lets vapors from the fuel vapor recovery system back into the intake manifold. On my car this valve is located up next to the left front fender liner. (However info I've looked at indicates this valve may not be used on the E420.) Bad fuel tank cap could be the problem as well. Try flipping the gasket in the cap over. (Does the low fuel light flash when there is plenty of fuel in the tank?) The other codes could be caused by bad igniton coils, bad plug wires/conectors and who knows what else. A trouble shooting exercise recommended by some of the veterans is to move some of the wiring or coil associated with the failing cylinder to see if the problem follows. Best to move one thing at a time. There is one coil for each cylinder. I've tried to attach a photo of one.

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Thanx so much for ur help okc329. The low fuel light does flashes alot even when i'm driving and there is plenty of gas. I will try to solve most of the problem myself...Its such a clean car with very low miles..anway thanx again...

302 is the cylinder specific code of 300. Probably a bad coil but could be spark plug wire or spark plug. You can swap the coil with another cylinder to see if the code follows.