How to replace your Audi A4 key battery and resync/program it to your car 

You're a lifesaver. I was contemplating of calling a programmer to fix my Audi A4 2005 model I got from someone before I stumble on this simple technique. In my case the car battery was flat and after charging it and I discovered that the remote refused to work. I was only able to open car door manually, at first I thought it was the remote battery that was weak. I got another remote battery of the same specification but no luck. After listening to this video, I tried it and It really worked like magic. I tried it the first time after counting 21 seconds but not sound of the door opening or closing, I then repeated the cycle again and behold the car switch working perfectly. Thanks man for this post.

Thanks. Three years after putting this video on you are still helping people. Just got my b7 Audi A4 central locking working. One key only so far but will try the other one tomorrow.

This helped me! I disconnected the battery of the car, and suddenly the lock/unlock didn't work anymore. Started fine, but I had to reprogram both keys to make them work on the central locking. Simple and easy😊👍 Thank you!

My 1995 1.8 a4:b5 needed a new battery replacement for the key fob. It wouldn't work after battery replacement. Found this video and follow the steps and now it works. Great tip, thanks

You’re a lifesaver! Worked on my 2007 A4 Avant Quattro like a charm, didn’t know my windows could go down and back up like that! Thanks.

Thanks mate, bought a used 2005 B6 A4, came with two FOB's. One of the fob's didn't work, put in a new battery and was still clueless why the wireless functions didn't work. Thanks for the video, cheers up

Thanks! This didn't work initially on my 2003 A2. I tried again and accidentally let the unlock button go briefly re pressed it and continued my count to 25 seconds and presto! it works!. I had two non functioning keys, so repeated the procedure on the second .Again I had to interrupt the pressing of the unlock button at around the 15 second mark. But hey, I now have two working keys. Thank you again!

Confirmed! It works perfectly. Fresh battery is a "key" component of this fix.

Nice and clear instructions. Thank you sir. My key is working great again. (A4 B6)

Thank you so much. My key was flashing but not working. Replaced battery still wont work. After just one reprogramming everything worked just fine. God bless youtube and free knowledge.

I done this as recommended on other videos for 6 seconds and it works temporarily tried it your way heres hopen cheers

Thank you mr. You just saved me 500$ cuz all I needed to do was reprogram my keys. I didn’t even need a replacement battery ❤️

I've had to use this video a couple of times over the years, and it worked perfectly! You're brilliant! 🌞

Very good video. This guy is easy to understand clear and no waffle. Top job plus.

Cheers just fixed mine did a re sync and hey presto plus made my spare operational as well which had never worked since I bought this car so thanks. You learn something every now and again. Great video especially the re sync bit which I knew nothing about, just shows how out of touch even ex mechanics can get with the simplest of stuff.

Thank You Very Much! You Literally Are Saving People From Getting Charged At The Audi Dealer! Worked Perfect On My 05 Audi S4 B6

Thanks dude it wokred perfectly :D , I was worried something was broke .I changed my battery yesterday and it didnt want to unlock.

Much appreciated, worked on Seat Exeo 2.0 tdi.

Thank you! Had some issues for a long time with my S4 B6, this worked flawlessly!

Worked prefect on my b7 s4 I had a weak battery out of the box just like you did

Nice one mate, just worked on my C5 A6!

Brilliant...spread the news....that would have cost me $50 at the Sydney dealers....on the other hand their coffee is free.....But thanks again...you saved me a long trip and $50....

Thanks, didn't know about the resync :D Key stopped working after I had plugged out the car battery

Thank you, I was going to take my two fobs to the main dealer but this worked perfectly

FANTASTIC BOTH KEYS WORKING LOVELY.

Worked on my a4 b7 Quattro, cheers buddy

thanx worked for me on my audi s8 2007

Excellent, thats so good to know. Thanks for taking the trouble to make this.

For my 1999 Audi A4 Quattro 2.8, the fob key battery replacement required 2 (two) CR1620 (3v) batteries.

excellent and nice touch with the paint as well

IT WORKED

Worked great for my B6S4! THANKS!!!

Was worth the watch just to hear the free airplane noise ;c) ps I have A4 B7 2008 and worked for me.

Just reprogrammed my spare key, thanks for a great video.

Thank you very much!!!

Man... I am so so grateful 🙏 Thank you so much

you are a wonderful human being

great video,i gonna try this today on my audi a3 2013,my key battery its low,my car show me this few days ago.

Really very easy and fast solve problem up to 5 min

Super useful and easy to follow. Cheers.

Thanks..worked great.. Funny though..I'd changed the battery a good few times before, but never had to do this. Could be that I had to get the transponder replaced recently. Anyway thanks again for info.

Spot-on mate, thanks! (B6 A4)

Thank you! Worked just as you described.

Saved my day thank you

Thanks a lot mate!!!! Worked first time

Brillliant man🙂Thank You!

Thank u Worked 4 me I`m appreciated

Helped me a lot however how do u code so that ur windows go up with the keyfob i dont seem to find the code in vcds ? Thanks in advance .

Thank you very much

Mine doesn't work sometimes but it's usually months between that happening. I've had it for 8 years now and never changed the battery. The middle button never worked though. I wonder if it's dead or there's some problem somewhere. Anyways thanks for the video.

Thanks, it worked!

Thnx very much!

Hope it works for me I have had to manually unlock so many times

One video shows me to place battery positive side down, another says place it positive side up- so which is it?

Life saver, thank you!

Merci beaucoup pour le partage 🙏🏻🙏🏻😀😀

What’s if this doesn’t work you replace battery twice and tried to put it in ignition and nothing ?

Thank you bro

Incase this doesnt work turn your vehicle on and press the unlock button for another 20-30sec it should work that what i did

Awesome, great! Thanks

Brilliant. Thank you!

Thank you Gentlemen

It’s work .. thank you!

Tnx mate!

FANTASTIC THANKS FOR THIS INFO

Thank you!!!!!

Hi mate, can you give us the link where to purchase the key cover (case), please? :)

I though changing my fob battery will help with a range but it did not. Does anyone know why it works only if you stand pretty much next to the car?

It worked

Worked! Thanks!

Take you bro. 🍻

Thanks!

Are there any other methods besides this one? Id swear I did it differently a couple of years ago for a neighbour, it involved sitting in the car with the door locked. This is a 2004 Audi A4 tdi. This wont work for me anyway, maybe the fob is dead. Also you say hold it in position 1 but your dash has lit up and the centre display is on, I would have to turn the key to position 2 to do that? Tried it in both positions anyway, neither work, tried it with a brand new Duracell straight out of the packet, nothing. Why are there so many different instructions? Do you know of a specific method for a 2004 Audi A4 tdi?

With a fresh battery I tried this repeatedly on my 2006 Audi A4 and it didn’t work for me. I don’t know why.

Wow! Thanks for this

Thaaaanks🙏🙏♥️♥️♥️

This didn't work for me. Anything else to try?

Thanks Bro, You help me ✌🏻👍🏻

thank you it worked

Didn't work for me not too sure if it's the key itself

thanks it worked for me :)

How to program key fob for a 2011 A4 though?

Useful

My car hazards are on the battery died in the car I replaced it the car will start but after it runs for 10 seconds it shuts off and won’t let me turn it back over without me taking the key out and trying again but it does the same thing will this fix the problem?

Thx a ton!

Didn’t work for me my comfort control module got wet I got a new one and a lot of my electrical doesn’t work

Thank you man!!

Legend.. the problem solve wasn't needed as the video showed that I had placed my battery back in upside down after my car battery had been re charged.. so all well

Wow thanks,,,,,!,

Will it work on a 2010 a3?

Thanks :)

Tell me some more about your steering wheel?????

How can i do for audi a4 2009

After battery in key fob died, i replaced it and it doesnt want to re sync it like this. Any ideas?

Brill 👌

You can just start the car and turn it off, and its work as well.

👍😁

On my A6c5 didnt work

None of this has worked for me. What shall I do now?

Didn’t work what I do wrong