Mazda Repair: Engine Light On - 2 codes, cylinder misfire, o2 sensor

Question
Hello,  I have asked somebody to scan and find out why is my check engine is on and he told me that there is Cylinder Misfire and Heater circuit flow.  I would like to know how much this will cost me.  My car is 1991 mazda miata.  Please help.

Thanks

Answer
pricing a job is hard to due unless one knows what it all needs.  with a misfire it could be a number of things could be just simply a spark plug or could go as far as being an injector. the heater flow circiut i'm going to assume you mean the O2 sensor and they can cost as much as 200.00 just for the sensor itself.