I have a 2015 Subaru Impreza coupe. The car has about 75,000 miles on it. While driving home from work about a week ago, the car suddenly began driving very rough with the check engine light coming on in a flashing mode within 3-4 minutes. I proceeded to drive directly to the local Subaru dealership, which was only a 5-10 minute drive away.
Upon performing a diagnosis, they informed me that one of the coils was bad. As there are four coils, it raised the question of whether I should replace all four coils or just the one. Here's what I learned from the dealership:
Subaru recommends replacing only the bad coil should one go bad
If a bumper to bumper warranty (or other warranty covering the coil) were in place and a coil went bad, Subaru would only replace the single coil
The dealership indicated that just because one coil went bad doesn't mean the other coils are any more likely to go bad than if they were on a different car which had similar mileage but never had a coil go bad
There is no recommended mileage at which the coils should be replaced
Coils cannot be measured for wear and tear. E.g. it's a black & white thing - either it works or it doesn't work.
The dealer says the only real reason to replace all four would be for peace of mind
My driving habits or the service history had nothing to do with the coil going bad
Based on this info, there doesn't seem to be any reason to waste the money to get all four replaced. Is there any reason I should get all four replaced as opposed to just the one?
Thanks in advance for all feedback
