Take it to a dealer.
You normally do not have to reprogram the key when you replace the battery. If you do you will have to contact your VW dealer.
you will need to go to a main dealer to get it reprogram it
You can use the two keys to reprogram the car remote of 2000 VW Jetta.
You need to either go to the dealer or a shop that has the VW tool called a V.A.G. tool and has access to the VW repair and reprogram site.
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battery can be bought at any Radio Shack.
In order to program a key on a 2004 VW Passat, you need to first put the existing key in the ignition.
The dealer can reprogram it for you. Or you can search VAGCOM on Google and find someone local to do it for you.
Need the year and model VW to answer the question.
I have a 2001 cabrio, not a Jetta, however, the dealer never wanted a key code only vin number. Hope this will help you out.
Resetting the computer is easy. Just disconnect the battery. Reprogramming the computer afterwards is the expensive thing. To the best of my knowledge the only way to reprogram your computer is to take it to a VW Authorized Dealer. Normally the vehicle will run if you reset the computer, but emissions, alarm setting, radio can be negatively effected by not reprogrammed.
Ok the issue you have is that the comfort module lost its programming that why it only opens the drivers door with the remote to reprogram this feature you will need a vw specific scan tool to change the coding in the value blocks you will need to find a vw service shop to be able to do this for you . I hope this helps. ---Mine did this when the bat. went dead---Read more: Volkswagen Passat GL 2004 passat only drivers door will unlock - JustAnswer http://www.justanswer.com/vw-volkswagen/4emry-volkswagen-passat-gl-2004-passat-only-drivers-door-will-unlock.html#ixzz1eVaGFaCd