I have an audi a6 2002 & need to program remote. replaced battery and doesnt work. read other ways to program, but i only have one key... thanks

My experience with frequently-used vehicle remotes (any make) is this:
1. When relatively new or in good condition, if remote stops working, the button battery inside is dead or too low.

2. If battery is new, & remote still doesn't work, a solder joint on the circuit board inside may have come loose or broken.(You can try re-soldering using a low-heat pencil iron & thin RESIN-core solder -- even if you're not great at it, what do you have to lose?)

3. It's rather unusual for even an older, well-used remote to simply lose its programming.If this is the problem, it may be cheaper to buy a new after-market remote (or pair of remotes) that you can program yourself (only works with some brands & years of vehicles, so READ THE INSTRUCTIONS ON THEIR WEBSITE BEFORE BUYING AN AFTER-MARKET REMOTE), instead of going to the dealer for a normally HIGH-priced programming job.

4. Used OEM remotes that match yours exactly (check the part # of your remote & the used one you're considering) can often be purchased from a local auto wrecker (now called "auto recycler") for cheap ($5 to $10 is common), but will need programming.I always go thru the many they have, looking for one that appears new or like-new.

5. IF YOU MUST GET PROGRAMMING FROM A DEALER, usually it's the SAME PRICE whether you have 1 remote or several remotes/keys programmed at the same time.Since dealer programming is pricey, I always have 3-4 remotes and/or chip-keys programmed at the same time.(My dear wife loses chip-keys & remotes from time-to-time, so I keep a few spares on-hand.I've found inexpensive after-market chip-key blanks at some key cutters and/or auto parts stores, altho they still require programming after the copy is cut from yours.)

CAUTION:Some OEM anti-theft systems require that ALL remotes & chip-keys be programmed/re-programmed at the same time, whether they're original, used or new.Determine this IN ADVANCE, so you know what you're faced with.The good news is that for those vehicle manufacturers, dealers normally don't charge more to program/re-program multiple remotes and/or chip-keys, if all are being done AT THE SAME TIME.

6. If all else fails & you MUST buy a new OEM remote (which will require programming), try 2 things -- First, see if the dealer will make you a package deal on buying the remote (or 2 remotes, or a remote & a chip-key) AND doing the programming for a lower combined price.Second, it may be cheaper to buy a new OEM remote from a dealer who's had one in stock for a long time & wants to blow it out (or buy from online OEM seller) & then pay the normal programming price.See the CAUTION above.

There are lots of options here, so hopefully something is useful to you.

i would get the OBD codes read by a mechanic as this should pinpoint the sensor/switch that is causing the problem

Sounds like you almost got it surrounded...

Put in those batteries... ELSE go to eBay...!!
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Carnac the Magnificent

Hi,

to replace your battery you only need a 1/2 inch socket to remove the battery holder bolt which is located on the left side of the battery then loose the battery terminal and you ready to replace the battery, if you do a replace in less than 4 hours you do not need to reprogram the key neither the remote.

if you have the battery handy , replacing the old immediately should not alter the programming
the program will not hold indefinitely but replacing is a may be 30 second job and most key fobs hold the program for a minute

Instructions:
1. Press one of the buttons of remote key.
2. Manually lock and unlock driver's door within 30 seconds.
3. System should operate normally after approximately 1 minute.
4. If not, carry out keys programming procedure.
5. Keys can only be programmed using diagnostic equipment.

Please do rate my response. Thanks!

You need to take it an have scan tool method done .

Open remote clean contacts w/alcohol get the correct battery--or go back to the owner -bull

There are two different programmings being spoken here...
1: is the "safety interlock" it's a security measure. if you go to start the car and a Yellow key flashes... that is the interlock security system. If you don't have a key specifically programmed for that car's VIN, it won't start. This can only be done at the dealership, and yes they charge about a hundred dollars. The price is the same for 1 or 10 keys for the same car. Some earlier audi TT's don't have this feature (including some 2001's). If you want one key reprogrammed to work, you will need to have ll keys reprogrammed. This programming is put into the switchblade's half of the remote. (if you pull the key apart there are 2 pieces, one that holds the metal switchblade key, andone that has all the remote buttons) a key without buttons is commonly called a valet key, which also needs interlock programming to work.

2: The keyfob's remote buttons. Lock/Unlock, Trunk open, and Panic. These need to be programmed by the dealer as well. They charge $50-$100. The price is the same for 1 or 10 keys for the same car. This programming is put into the half of the remote with all the buttons (the keyfob). This is not a necessary feature to operate the vehicle.