Need some advice about CEL!!!

I recently picked up an 06 Tacoma 4.0L and the previous owner installed Doug thorley headers and full straight pipe to rear muffler.

The cats are deleted and I’m getting several CEL codes. It’s running limp and rich, and overall driving like shit. I’m in WA state.

CEL Codes
- p0137 - o2 sensor b1s2 low voltage
- p0158 - b2s2 high voltage
- p0606 - pcm processor
- B2799 - engine immobilizer system
- C1241 - low battery voltage or high voltage
- B1650 - occupant classification system fault

any ideas what could be triggering all this? How should I go about fixing this?

many thanks
Justin

 

Deleting the cats caused it. To fix it, restore everything to stock.