It could be a leak around the supercharger. Have the gaskets below the throttle body ever been replaced?

 

the supercharger has never bee off the car.

 

Suggest a pressure test, how good are you with wrenches?

 

 

Someplace there is either a thread or a video on making your own pressure testing boot by buying some pvc fittings at a hardware store. You can buy the thing on line as well. You put in the hose that goes from the air cleaner to the throttle body. I found I had some good leaks around the BPV. Took off the euro clamps and replaced them worm drive.

Below is what I made, 2 1/2" PVC end cap. In the middle of making getting a second Cat made up for my OBX header so work bench is a mess.

 

The P2096 code is one of those codes that cannot be cleared by an over the counter OBDII scanners. It has to be cleared by the dealer or shop that has one of those special diagnostic machines. I had WayMotorWorks clear mine a few months back. I would get a ODBII scanner that can graph the output voltage of both pre and post O2 sensors to ensure everything is working correct. I used the Pro Torque app on my android phone. It works pretty good. The pre cat O2 sensor voltage should swing between .1 and .8 v as the ECU compensates rich and lean conditions. The post cat O2 sensor voltage should be fairly steady around .4v - .6v when running at steady speed. This displays that the cat is working properly. You can spend a lot of cash by blindly replacing stuff. Get the right tool so you can correctly diagnosis the issue.

 

Thanks for the great input. i will start working on the problem

 

 

I have had this code twice. Both on diffent r53. Both times it was a hairline crack on the header