Just realized our cars have coilpacks and not spark plug wires. So do those have to be replaced? Had an H22 before and I swapped the wires when I did the plugs.
Correct they are Not to be touched if 1 were going or has gone bad the Check engine will turn on and will tell you witch is misfiring I would not touch them unless I needed 2+1 on replacing only when needed. You can always replace them when your car is getting up there in mileage for peace of mind, but I don't really see a need. I had one go bad two months ago (130k miles on my '05) as the car was misfiring. Plugged the OBDII code reader in, found out what cylinder it was, swapped it with another coilpack from another cylinder to confirm that it was indeed the coilpack, which it was. Easy 5 minute DIY replacement.