K&N CAI issues. All help welcome
 

Alright so I installed my K&N typhoon CAI on my BRZ I've had no issues with it, but after about 5k miles driving with it installed my engine light came on with traction control light. The next day the check engine light came on so I got it scanned and threw 3 codes

P0171- bank 1 system too lean.
P117B- No DEC definition found see service manual
P117Ø

Subaru won't touch my car because of my intake and want me to drop 875$ on stock everything and they say it may not even be the problem. So I have no idea what's wrong with my car it's almost time to park her for the winter and it sucks because I really want to drive it before hand lol..... so please help me out.

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put the oem intake back on

You need to scale your MAF for that intake.

Even after putting 5k miles on it? Wouldn't the CEL come on within a week or so after installing?

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put stock intake back on
pull positive terminal on battery


should be good!

You just got lucky for a while is all.
Scale the MAF or go back to stock. You don't want to screw things up.

maybe the MAF is dirty or oiled because the k&n filter came with lot of oil ( if its a wet filter) but the problem should be something with the MAF, probably.