Just wondering what could have caused cylinder 5 to misfire.
Yesterday I was coming back from a ski trip going up hill with a fully loaded car @ about 150~160km/hr. The engine light started to flash so I took my foot of the accelerator. Then whenever I would speed up to +125km/hr it would come back flashing. This morning I was driving around and no problems until again I reached 120km/hr, but this time the engine light stayed on. I checked the code and is 75 - P0305 - Cylinder 5 misfire. I'm not sure what could have caused this... anyone know? Any DIY I should attempt before going to the dealer?

I'm taking her to the dealer this weekend to have a look at her. Currently have 95,000km. I should also mention she's been dealer serviced since day one and never had any issued, completely stock.


Thanks.

Jon