Hello,

I have a P0302 code.

However after switching the wires cylinder 2 and 1, resetting the code, I still get a P0302 after a while. Usually the cars starts rough in the morning (when its colder), but then its fine after 2 minutes.

any ideas of what could be the problem ?

Thank you

 

Still could be the coil or the plug itself.What year is it and when did you replaced these items if ever?

 

I dont think the coil was ever replaced. However, if I switched the coils including the wires, wouldnt that change the cylinder number if it was bad ?

2001 Volvo S40

 

Yes it would have that is why I did ask.Now you only mentioned that you swithed the wires I thought you didnt switch the coils.If you did then the answer is obvious.Change the plugs but all of them.Get nothing cheaper than OEM platinum's.