Hey guys, just finished researching and I learned the P21B2 could be caused by too much air flow from my K&N intake. This is it:

https://www.knfilters.com/cold-air-intakes/cars-and-trucks/63-1562-performance-air-intake-system

I was wondering if anyone has had this code with this specific intake and had success eliminating the code by covering the ram air scoop.