Hello there so I have an 07 Q7 V6 that won’t start. The doors unlock and lock with key the dome lights work & so do the hazards etc. when I open my door the only thing that pops up on the cluster is the miles but when I put my key in the ignition nothing my happens when usually the steering wheel will unlock and the dash will turn on but it doesn’t do anything. I just replaced the battery in both the car & key fob & still nothing. I checked all the fuses and I also replaced the relay next to the battery under the driver seat. I tried to connect an OBD reader to it to find out what is wrong but even that won’t work I have no clue what to do nor do I know what is wrong. If someone could PLEASE help me I would really appreciate it! 

Welcome to the forum you'll find the members on here are a friendly and helpful bunch. 

Was the battery coded to the car when it was fitted? 

Well done for trying to plug it in. You'll definitely need a diagnostic check to see if any fault codes flag up? 

Have you got home start with breakdown cover? 

Also I've hidden your other thread as it's a duplicate. 

Cheers 

Steve 

No the battery wasn’t coded to the car and when I try to use an OBD Reader it won’t work because there’s no power 

2 minutes ago, W2FINEST said:

No the battery wasn’t coded to the car and when I try to use an OBD Reader it won’t work because there’s no power 

Ah, it'll need to be coded. This link might help further: 

https://www.elektroda.com/rtvforum/topic3405132.html 

Have you still got the old battery? 

This video shows you how to code it: 

Might be worth you getting an auto electrician to come and code it. 

No I don’t have the old battery 

Could I code it myself ? 

Edited January 18, 20251 yr by W2FINEST

And my car wouldn’t start or get any power even before I changed my battery 

The video on my previous reply might help. Also the Ross tech site has lots of useful information: 

http://wiki.ross-tech.com/wiki/index.php/Audi_Q7_(4L) 

Specific details on their battery section: 

http://wiki.ross-tech.com/wiki/index.php/Battery_Replacement 

I believe the obd port is fused so might be worth checking the fuse. 

This video might help with connecting obd11 to it: 

https://youtu.be/QH283J1Wkno?si=-ByYuL3bZ8fBi2DB

Think the obd fuse is in the fuse box at the left end of dash and is in the middle row of fuses, brown holder and is fuse location #12

So the battery is programmed and still nothing what I think it might be is the steering wheel lock thingy so I ordered this repair kit hoping it is this if not then idk what the heck it is 

Yep could be. Glad battery is programmed. Did you check the obd fuse?