CEL still on after o2 sensor [Archive] - Toyota MR2 Message Board

sensor, wire, header, replace, single, code, week, means, slap, autozone

I got a CEL last week and a code 21 which means the o2 sensor. So I go out to Autozone and slap a new one on...single wire right in to the header. This is the only sensor I got and never had a CEL before. After I replace the o2 sensor, I still get a CEL...???