Cylinder 4 miss fire code p034
change the spark plug, if it still has a miss, change the sparkpug wire if it has one, or the COP if its that style
You mean 304. See my response to other poster. Before changing the wire just twist the coil end #4 wire so it doesn't touch metal, and make sure the plug end boot is PUSHE ON securely. Clear CEL. It it recurs check plug. If wet or bad replace; if wet use stop-leak in oil to close up oil leak. Very rarely will a coil pack be bad.
Search Subaru Impreza Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Subaru Impreza Experts