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I went back and forth several times on what to do about my ignition coil problem. Two of my coils are original and have over 100k miles on them. The other 2 were replaced in 2017 and 2019, both have 4 track days on them, one has 35k miles, the other has 20k mile. The one I had replaced in 2017 is the one throwing the code. I suspect the one I replaced in 2019 will not be longer after. The way I saw it I had 3 options.
1) Buy another 2013 coil for $91 (SU003-04713) and replace the one that failed. This solves my immediate problem, but I could easily throw a code for another coil next track day.
2) Buy 4 2015+ coils for $400 (SU003-05259). Buy the iWire Ignition Coil Plug E connector kit x4 for $72. Pay a shop 3 hrs of labor to repin my existing harness to work with the updated coils.
3) Buy 4 2015+ coils for $400 (SU003-05259). Buy the Subaru updated harness for 2013 (24020AG620) for ~$300. Pay a shop 10 hours of labor to replace the harness.
#1 is the cheapest, but isn't future proof. I ended up going with #2. While I could have done the work for #2 or #3 myself, that is a bit outside my comfort zone. I will report back if I run into any issues.
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