Check Engine Light on for several codes, all linked to air intake, help please!

What is your question?

Hello, I own a 2013 Buick Regal Turbo - Premium 3 Trim. About two years ago I installed a cold air intake (K&N Typhoon)... the intake works well to provide a couple extra hp and I had no issues until about 2 months ago. The issue that arose was my CEL illuminating; so, I took it in for a diagnostic. Upon retrieving my car I was told the CEL was on because of several codes - P11C2 (Humidity Sensor), P2199 (ITA Sensor Corr.), P0178 (Fuel Comp. Sensor), P0097 (Intake Temp Sensor), and P0102 (MAF Circuit)... Their advice was to replace the MAF, clean the air intake filter, and clean the throttle body... and since they were going to charge 1000% of actual parts cost, I did the work myself. I replaced the MAF, cleaned the air filter, and inspected all the wiring w/ the various sensors related to the engine codes - all look okay. I cleared the codes a couple days ago, yet the CEL re-illuminated still listing the SAME CODES. Any ideas on what could be happening?? Thanks in advance!

What makes this problem better or worse?

Possibly some slight accel hesitation, but minimal.

How long has your 2013 Buick Regal had this problem?

A couple months.