Buying/programming second key

U

Un4tural

Member
Hi All,

I've had a spare key with the car (one of those without a fob, with immobilizer chip which sadly does not work, seemed like a 3rd party key) and need to get a second working key just in case and so Mrs. can have it.

I am a bit split between looking out for a comfort module with 2 fobs (there was one recently for 40 or 50£ on here) and simply swap it for sake of having the fob working properly or if to go look to get a key cut + acquire a fob from somewhere, which seems to be rather difficult as usual suspects like ebay only seem to have replacement shells (which i could also use one or two of, though i am struggling to trust Chinesium).

Anyone have experience with this, as it does not seem like a very simple task to do pair another key or reprogram an old fob. Also there seems to be a difference between earlier and latter model A2 keys not being interchangeable. Any idea of anyone who can do this SW london area and for how much?
 
Hi,

I am also in need as a second full working key to act as emergency backup and have been looking into this as well and there seems lots of pitfalls. If I follow your post correctly if you buy a CCCU with two fobs You will be short of an immobiliser chip for the second spare key. If I understand the system correctly you will need to buy a virgin immobiliser chip and the use of appropriate kit to retrieve the immoliser code for your car and set the virgin immobiliser chip to this code to obtain a second fully functional spare key. If you buy a compatible used key fob off eBay you will also need kit to pair it to your existing CCCU as well as resolve the immobiliser aspect as above.

Sarge in NE London may be able to help out, I would send him a PM. Not being in London I have no other suggestions.

Andy
 
spike said:
As a starting point, have a look through the posts in the keys and locks section of the 'How To' index - https://www.a2oc.net/community/inde...-how-tos-and-useful-threads.27103/post-218091

Cheers Spike
Click to expand...

I've read various posts and honestly if it costs 30-40quid i rather just pay someone who knows how and has done it before to just re-program a key or program a new one... I've got a few cables and probably not a massive issue, but seeing few kits on sale here to reprogram keys with readers for frequency used etc. i really do not feel comfortable mucking about.

While not incompetent i rather not r*pe my car's brain when i don't really understand the system that well using a dodgy cable off ebay. Tried the key in door method and it does not work.

Ideally if someone does have a AF CCCU with 2 key fobs and keys with the immobilizer bit on them i'd be happy to purchase these.

Thinking about it immobilizer chip is not paired to CCCU(presumably ECU?) as i am using old key blade now with replacement CCCU and Fob as original CCCU chose not to see any of the door locks. or the original key fob. likely why different cable is needed per the guide?

@Sarge Sorry to be a bother, is this something you can help with? Happy to drive over someday when i gather bits i need.
 
The plastic end of the key where the blade attaches holds the immo chip which is paired with the engine ECU/instrument cluster
The other end of the key holds the circuit board and battery and this is used to unlock/lock doors etc. This part is paired to the cccu
You need two cables one to program the immo part of the key (along with a new immo glass chip as these are one shot programmed and as such can’t be reprogrammed) and a different cable such as vagcom to code the cccu wither key remote
From memory the cccu accept a maximum of four keys
Other think to watch out for is the two different frequencies used my the early and latter A2’s as all the programming in the world will not pair a different frequency key to the cccu
Cheers. Paul


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If it is of any help, assuming original CCCU, then the CCCU/fob frequency is normally given in the options code on the sticker in the handbook/boot, but you will need to decode it. The frequency can also be found on the key fob if you care to split it.

I hope you are now clear on the immobiliser chip after Paul's post.

Andy
 
Thanks for the details everyone, definitely doesn't seem like something i can undertake, immobiliser seems to need a pricey bit of kit to code as well, Timmus mentioned he can code additional keys so will likely do it along with bose retrofit at some point.

Seems to be a small ordeal to get additional keys programmed.
 
I know @timmus is very capable ( and busy ) but any good car locksmith can set up additional keys. NOT trying to take work from Tom but not advisable to only have one key for any car you are tempting fate. Buy a new upper with a blank chip and key blade, a second hand functioning remote of the correct frequency can be reprogrammed into the CCCU easily, get the blade cut by an auto electrician and they will program the immo to the dash and set up the remote. Quite often these guys are mobile and will come to your home or place of work. As you can imagine if it were too easy to do more cars would disappear that is why manufacturers try to control who can program immo chips.
 
depronman said:
The plastic end of the key where the blade attaches holds the immo chip which is paired with the engine ECU/instrument cluster
The other end of the key holds the circuit board and battery and this is used to unlock/lock doors etc. This part is paired to the cccu
You need two cables one to program the immo part of the key (along with a new immo glass chip as these are one shot programmed and as such can’t be reprogrammed) and a different cable such as vagcom to code the cccu wither key remote
From memory the cccu accept a maximum of four keys
Other think to watch out for is the two different frequencies used my the early and latter A2’s as all the programming in the world will not pair a different frequency key to the cccu
Cheers. Paul


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Click to expand...

Isn’t there 2 way of doing it, on my mk4 golf I programmed the car to the transponder not clone the current transponder in my current key.


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Even if you could do it that way round you would need to get two keys from the same donor car AND know the SKC of the donor car
I’m not sure if this would work even if you know the skc
Cheers. Paul


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depronman said:
Even if you could do it that way round you would need to get two keys from the same donor car AND know the SKC of the donor car
I’m not sure if this would work even if you know the skc
Cheers. Paul


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Click to expand...

Yes you need the SKC this is how it’s done from factory I believe as the 2 keys have different IDs and are not clones of each other. In the mk4 this was done as one of the features of the seats I used was that it could identify the driver by the key and adjust the seats.


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The a2 as only ever got one skc
It is stored in the instrument cluster and the ecu
It is needed to code extra keys to the car immo


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Hello
I remember Steve Birchall had a set of new keys and the equipment to program them. He sold the lot on here but I can't remember who bought it.
I am also in need of a 2nd complete key/remote for my FSI. I found one on fleebay but £75 and the need to program it, I had to refrain myself.
Hope more info will come in the next few days.
Cheers
 
Captain059 said:
Hello
I remember Steve Birchall had a set of new keys and the equipment to program them. He sold the lot on here but I can't remember who bought it.
I am also in need of a 2nd complete key/remote for my FSI. I found one on fleebay but £75 and the need to program it, I had to refrain myself.
Hope more info will come in the next few days.
Cheers
Click to expand...

Yes he did he used the new style key and he programmed the car to the key, I bought one off him a while back for one of my cars... however my 2 year has put it somewhere I cannot find


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depronman said:
The a2 as only ever got one skc
It is stored in the instrument cluster and the ecu
It is needed to code extra keys to the car immo


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Click to expand...
This is correct, I’m referring to the ID of the keys.

You need the SKU for the cluster/ecu then you can login and code the car to the key.
 
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