Air Fule Ratio Thru The Roof K&T

Up until today My 09 800S has been working perfectly. I have a K&T turbo set to 10# boost. Air fuel is as follows
Idle 12.5
Partial throttle 13.5
WOT 13.5

My problem now is that while riding some woops ad bumpy trails I punched the throttle and the motor fell flat on its face. I let off throttle and it picked back up. So I checked the a/f gauge and pinned it again and the gauge read 17.5 ratio. And now I’m only able to make 3.5# of boost. Waste gate actuator is working properly too I think.

I checked the pure logic controller and nothing seems wrong there. As far as blinking lights to warn me that I need to make a change there were not any.

I looked things over and all seem to be in order as far as no loose wires no blown hoses. The manifold is billet and is in great shape.

And now I have a check engine symbol on the dash gauge. Can anyone give me some advice prior to me taking it to the dealer.

Fuel pressure is at 38 pounds. I took it to 40 and had the same problem so I put it back. Oil level is good.

Maybe the o2 sensor? Suggestions would be great. Thanks Don