I got a hondata s200 and a p28 ecu the engine is a jdm b18c type r in a eg and the check engine light comes on for a oxygen sensor code. The car is already tuned but it still turns the cel light, it does not feel any different in power when the cel light is on. I do no know what could be the problem. thanks

 

i think you O2 is bad....

 

hondata bypasses the original oxygen sensor