CEL issue - O2 Simulator

[limch1]

My car got throw in new CEL code.

P0422 Main Catalyst Efficiency Below Threshold (Bank 1)
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0140 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)

 

[limch1]

Finally I'm back to normal. I've fixed back my original extractor and no more CEL for me. The car suddenly sounded so quiet as compare to last time. I believe the best is not to change any aftermarket extractor for Elantra.