Why is my Subaru is showing a PO 304 code 3 weeks after I replaced the coil pack

Asked by Kevin559vice Feb 21, 2022 at 06:39 PM about the 2006 Subaru Impreza 2.5i

Question type: General

I have an 2006 Subaru wrx I recently bought the car
from a friend because he bought a new Subaru and
cylinder number 4 had a misfire..I replace the coil
pack everything was running fine for about three
weeks and now it’s reading Cylinder number 4 has
a misfire again .. I’ve checked all the wiring
everything is tight I’m stuck in confused it’s
showing a PO 304 code

1 Answer
310,565

Gene answered 2 years ago

Spark plug, injector on that cylinder, vacuum leak, compression problem, ie valves, headgasket, rings.

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