npaki786

After searching, i had no luck in finding a real solution to my problem.
I have a 2007 C-280 with about 70k miles on it. I just recently did an oil change and right after the car has been acting up.
1) Rough idle
2) A bit of loss of power
3) And today, there was white smoke at start-up and it took a while to kick over when i started.

I had a check engine that came on, but then it turns off (this has been happening for the past 6 months now). Went to Autozone and the readout is
P0302.

I'm replacing the fuel filter tomorrow, but I have a feeling the o-ring might be missing when the tech did the oil change, plus I figured I need to change the spark plugs..

Anything else I need to do? is it safe to drive w/o the o-ring??

C230 Mulac

P0302 is "cylinder 2 misfire."

Search the forum or google and you will find a solution. I typed "w203 P0302" into google and got a bunch of results.

pcy

npaki, based on your description, your car seems to have multiple problems. Copper washer on the oil drain plug has nothing to do with misfiring or rough running of the engine. Is the oil leaking under the car from the drain plug?

Cylinder 2 misfire could be due to bad spark plug, coil pack (likely), or ignition wire. To narrow down the culprit, swap the coil pack/wires with neighboring coil pack/wire and see if the problem code changes.

npaki786

Thanks,
I decided i'll take it back to the oil change place, to check if the o-ring is missing. replace the fuel filter, spark plugs and coils.