I recently bought a 2002 jetta tdi, no check engine lights are on but something is drawing juice from the battery and when i go to start it after an hour the battery is stone dead with nothing on in the car. Next when i hit my lock and unlock button on the remote, the only door that locks and unlocks is the driver door. Anybody know what the problem could be?

you need to have the codes retrieved out of the computer then start a diagnosis from there

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Check, clean and tight correctly the battery leads. If the problem still occurs remove the electrical starter motor out from the engine, repair it (change carbon brushes, bearings, ...) and install it back in place. Then test the engine. It should cranking & start immediately.
Good Luck!

could mean replace oxygen sencer or take battery terminals off for ten minutes to reset your computer then replace them red meaning+ black meaning _ negative

First- make ignition key in operating condition,replace battery.Than try locking & unlocking vehicle.If O.K. try to start engine.If not check main fuse- in engine compartment next to glow plugs fuse. 80 Amps

How old and what quality is your battery? If you have the original or an aftermarket battery in it, make sure it's within the rated life before you start messing with other things.

It sounds like one or more fuses have blown. (Your car has fuses rather than circuit breakers.)

Open the driver's side door and look at the area near where the door hinges. There should be a panel that you can open on the side of the dashboard. Use your key or a screwdriver in the small slot to open the panel.

However, there is a yellow, plastic tool attached to the inside of the panel that will help you to remove and insert fuses.

See the following link for a "map" of the fuses.
http://forums.tdiclub.com/showthread.php?t=106260

I'd recommend checking fuses 14 and 38.

standing at the front of the car pull the cover off the left side of the motor and check the belt. No tools are required the check the belt. Cover pulls up and off. It's to the left end of the valve cover.

very common for the harness that plugs onto the glow plugs to have too much resistance it will still work but will set codes

Don't know much about VW but if it's fine, and it doesn't happen again I wouldn't worry about it. If it does try resetting the ECU by removing the battery terminals and touching the positive lead(red wire) to the negative battery post. It might spark a little, this is just the capacitors discharging, resetting your ECU and starting over. It's like restarting your personal computer

did batteries work temporarily?.. you then have a parasitic leak sucking power when not running...radio aftermarket or alarm or gps will do it ...also checking ground from battery is critical to good connection