I made a $140 mistake with the Subaru this week. My running lights weren’t working. I changed the fuse, I replaced the bulbs. Still no go. I took it to the mechanic figuring it was an electrical problem. The mechanic calls me the 4 hours later. I had put single filament bulbs instead of double filament. 6 dollar bulbs, but I had to pay $140 for the hour service.