Heys guys hows it going? I own a 05 WRX Premium that is at 66k miles and the only mod is a Borla Catback exhaust. My CEL light came on recently and the code at Autozone read as "Too Lean". Took it to the subaru service station and they said the previous owner didn't change/clean the Air Filter which led to gunk building up. So they replaced the air filter (something I could have done myself but Im a noob to the car game still) and cleaned out the build up. A week the later the CEL comes on AGAIN and the same code is reading. Any tips? I mean the CEL as gone, but now its back. I have the receipt so Im going to take it back to them, but Im out of town right now. Dont like driving around with my CEL light on. Also what damage could this possibly cause? Please dont flame, I just need help. Thanks bros.