Mitsubishi Repair: Mitsubishi passes emissions but fails smog because it monitors cant reset the sensors, california smog, automatic failure

Question
I've tried taking my car to several smog shops and even dealerships and I feel like I'm not getting a straight answer. Basically it has no problems passing the emissions, there is no check engine light but for some reason the monitors cannot reset the sensors so it will result in an automatic failure for California smog. What is it that needs to be looked at/replaced? What am I looking at in terms of costs? Car runs great other than this issue here there has been no problems....

Answer
Hugo: I would have the computer coded, that would explain what is going on with your car and maybe then explain the problem to you. If you got an AutoZone close by they would do this for free and see what the computer kicks out at you.  God bless: Linda