aFe cola air intake

[Bdcupp]

Just installed the aFe Momentum GT in my 2013 ATS 2.0t, now the CEL is on, got the code checked, it is showing P012B O2 sensor delayed response - Lean to Rich Bank Sensor 1. I also have custom exhaust. What is the remedy for this CEL?

[ChaloBoogie]

Ive been researching mods for the ATS as I just got a 2014 ATS AWD 2.0 Turbo. From what ive gathered is that you have to tune the car after getting mods to clear codes