Hyundai Repair: 2000 Hyundai Elantra Codes, hyundai elantra, fuel vapors

Question
Hi my check engine light has been on for a while and i've had a local mechanic look at the car and he says there are codes that have come up but he doesn't know what the problem is and says i'm going have to go to the dealership. I would like to be as educated as possible before i take the car in (i'm a young female and i don't want to be taken advantage of anymore that i have to be) I'd appreciate any help you could offer.
The codes are: po441b (evap control bad), purge flow, po722a (output speed sensor), circuit no signal.
i'd appreciate any help you can offer and if you know about how much problems like these could cost me(i'd like to be prepared for the bad news).

thanks so much.  

Answer
P0441 indicates an issue with your purge control flow.  Purge is the system the vehicle uses to burn off excessive fuel vapors.  Emissions laws require the vehicle to burn them off rather than vent them into the atmosphere causing pollution.  It's likely that the problem you have is that the purge control valve, an electric valve operated by your engine computer to allow the vapors to enter the engine, is stuck open.  As automotive repairs go, this is a relatively minor repair.  

Your transmission computer monitors through speed sensors (called pulse generators on your vehicle) the rotational speed of the input shaft of the transmission and the rotational speed of the output shaft of the transmission.  This data, along with other items the computer monitors, help the computer to decide when it's appropriate to shift.  P0722 indicates that the transmission computer doesn't think the signal it's receiving from the output speed sensor is correct.  On your vehicle, this is most frequently a problem with the pulse generators themselves, but there are other problems that could be causing this code.  If pulse generators are all that's needed, this is also a relatively minor repair.

It's difficult for me to give you a price estimate since prices will vary by the shop where the work is done and your geographic location.  I'd be surprised if doing both the items above cost more than $500.

Also in regard to the P0722 code, Hyundai has a very nice technical service bulletin describing the diagnostic procedure and possible issues.  You can view technical service bulletins, the shop manuals, and other information at www.hmaservice.com.  You'll need to register for a free account, and the site requires Internet Explorer.  In this case, you'll be interested in TSB# 03-40-022.