Hi everyone,
I am having some problems I can't figure out. I am in my 5th 300 and have never come across this on any one of them. My check engine light came on so I looked into it with my OBD2, and it came up with 4 codes. One being misfire in cylinder 2, the other 3were all multiple random misfires. I started with the obvious and looked for any leaked that would come from the head gasket which turned up negative so the second cheapest fix being spark plugs, the spark plugs were bad but not enough to cause these codes but I replaced them anyway. And the check engine light went out for about half a day. Going back to my scanner I get the same codes, next I go to ignition coils, they too are in good shape but replace them anyway the check engine light goes out for about 2 hours and it is in again. I haven't had time to go any further into diagnosis so I've been driving it with the check engine light on one day and out the next but this is weird part
Thos car has never ran better than it does right now. It sounds amazing, exeleration is the best it's ever been and even fuel economy is fantastic with getting it past 200 kmh frequently, does anyone have some kind logic or input into this. I really appreciate any comments concerning this.
thanks ahead of time.


That's my fifth one, the last of going through all trim levels ending with a base. I should have started with this one, I only have two of the others a black sport and a C all second gen.

 

Sounds like an o2 sensor bank 2 fault that would cause the multiple misfire as that would send either a too rich or too lean mixture to the cylinders causing the misfire hope that helps