I just bought a used 2001 Subaru Outback L.L.Bean, and the check-engine light is on due to misfiring in cylinders 1, 3, and 5 (right side only). I thought I was getting a pretty good deal even given the CEL risk, but the car is at the mechanic now and he is stumped and telling me I have to take it to a dealer service center.
This is a 6 cylinder with a timing chain. Plugs were replaced and computer reset and the light came right back on. There are no spark plug wires, and I read that the coil packs rarely fail. The engine runs smoothly and seems to have power, but since I just bought the car used so I’m not sure how much power is normal. It has 122k miles.
What could be causing misfires on one side of the engine only? Any ideas?