I’m just seeing UncleTurbo’s comment now, but following up on yesterday’s comments: I went to the shop this morning. The mechanic there told me they use nothing but OEM parts; he was not more specific than that. He also checked the code and said the problem is the same coil that they replaced before, number 4. I went to a parts store and got the code: P0304, cylinder 4 misfire. (Also P0440, evaporative emission system; I got a new gas cap on the recommendation of the parts store employee.)
The mechanic said they would replace the coil in number 4 again for me tomorrow.