a little background info. i replaced my front O2 sensor this last week with a brand new Denso. the old one was reading Bank 1 Sensor 1 slow response. i was told that it could be a couple things. 1) a lemon O2 sensor(very rare), 2) cold exhaust gas(i live in the midwest), and there was one more thing but i cant think of it. I heard its a pretty common issue with the OBD2 engines, which is what i have. I just want to know what the hell I can do to fix this stupid issue i've been dealing with since last fall. i do have dc headers, test pipe, but that O2 is fine and catback. Would a check engine light eliminator for headers possibly get rid of it. That fixed my test pipe one.

 

Is the O2 sensor heater working?