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Discussion Starter #1
The Treg I bought has only one key fob. Sellers said he lost the second one and didn't bother to replace it.
I need to get a new key and I also want to reprogram the existing one so that the lost key won't be used to open the Treg if it crosses his path :grin2:
What are my options without going to the dealer.
I have VCDS. Treg is a 2004 V6 3.2.
 

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Discussion Starter #4
I understand this will replace the whole system but not sure about the alarm system integration with this setup.
 

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You shouldn't have to worry about the lost key. If you simply add a new spare (additional) key the adaptation process clears all previous adapted keys. If some moron tries the "lost" key it will not be able to open (electronically ), or start the car. It will no be able to disable the alarm if manually unlocked.. So I suggest you may not have such a concern as to warrant a complete swap.

Stuart...
 

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Discussion Starter #9
You need to register to download it. It apparently only needs a simple kkl cable from ebay. I will try my vcds cable in dumb mode.
 

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Discussion Starter #10
another helpful post here:
VAG keys - VW SEAT SKODA key info | eBay

copy and paste here to keep a copy in this forum:

My name is Robert and due to many questions I receive and some confused customers I decided to write this guide
This guide should help you to understand how key is build, what does it contain etc.
If you read this guide you should avoid headache after buying empty shell, second hand or wrong key/remote.
So lets start.
We can divide keys into 2 categories and some sub - cattegories
1) keys with remote
a) flip style key

b) not flip style key


2) keys without the remote


1) Whole complete key key is built from 2 parts
- remote

- blade part with transponder


***REMOTE***
Remote is responsible for central locking ONLY. Inside remote you can find circuit board and battery.
VW/Skoda/Seat cars use the same type of remotes, which can be 2 or 3 button and they operate with frequency 433 MHZ or 434 MHZ.
Each remote has a part number. Some of remotes have different part numbers but they are 100% compatible i.e.:

1J0 959 753 AH = 1J0 959 753 DA ->> 3 button 434 MHZ (square shaped remote), 1998 - 2006
1J0 959 753 A ->> 2 button 433MHZ (round shaped remote), 1998 - 2001
1J0 959 753 B ->> 3 button 433 MHZ (round shaped remote), 1998 - 2001
1J0 959 753 N ->> 2 button 433MHZ (square shaped remote), 1998 - 2001
1J0 959 753 AG = 1J0 959 753 CT ->> 2 button 434 MHZ (square shaped remote), 2000 - 2008
1K0 959 753 = 1K0 959 753 G ->> 3 button 434 MHZ (square shaped remote), 2004 - 2011 (CAN-BUS cars)
1K0 959 753 N ->> 3 button 434 MHZ (square shaped remote), 2007- 2011 (CAN-BUS cars)
we also have non flip remote keys. Each non flip key has compatible flip style replacemetn. Please contact me if you need advice re compatibility.

If you are looking for replacement remote it MUST have the same or equivalent part number and frequency, otherwise it will NOT work.
I.e. you CAN NOT use 1K0 959 753 G as a replacement for 1J0 959 753 DA .
In some cases 1J0 959 753 AG/1J0 959 753 CT can be replaced by 1J0 959 753 AH/1J0 959 753 DA i.e. late Bora, Golf, Octavia MK1. But there is no rule.

Remote coding procedure is shown on my YouTube movie which can be found under link below:

USA/Japan/Mexico cars use remotes with 315 MHZ frequency and they have different part numbers.
If you need one - please contact me for quote....

******BLADE PART WITH TRANSPONDER********
Blade part has little transponder chip enclosed inside.

This transponder chip is responsible for communication with immobiliser system.
Each coded transponder contain digit code and the same code is saved in cars immobiliser system. When you try to start the engine of your car, transponder sends that digit code to immobiliser system for verification. If code saved in immobiliser match with code in transponder - you will be able to start your car, if they don't mach you wont be able to start your car and immobiliser activation icon will flash on the dashboard.

Each new transponder needs to be coded to immobiliser system before it can be used, otherwise you wont be able to start your car as digit code mentioned above will not mach.

Each transponder which you (or specialist) are going to code to your car have to be blank - virgin - new as transponders used by VAG cars can be coded only once. transponder which has been previously coded to different vehicle will be useless. Coding can be done only by professionals I.e. auto locksmith workshops or dealers. Coding prices start @ £25 up to £70.

So remember - if you buy second hand key make sure you will get it with new blade and transponder. Many sellers change the blade but they don't change transponders - in that case key will be useless. Also on eBay are available empty shells - be aware of that as well - read description carefully.

TRANSPONDERS TYPES:
Most of Volkswagen Audi Group (VAG) cars use following transponders:
1998 - 2004/5 - megamos crypto 48 transponder
2004/5 - 2007 - CAN-BUS megamos crypto 48 transponder which are pre-coded to brand -> VW or AUDI or SEAT or SKODA.
2007 - now - transponders pre-coded with kind of VIN number code. not many auto locksmith workshops will be able to get those pre coded transponders as required equipment costs around 4000-5000 Euros....

some vehicles use different type of transponders I.e.: Lupo, Sharan, some polo (crypto 42,44)

*******NOT FLIP STYLE REMOTE KEY******************

each non flip (remote) key has its flip style compatibel replacement. usuallly most Seat cars has been equipped by factory with non flip remote keys. For each key there is compatible replacement. please contact me with car details and I'll do my best to find out compatible replacement

*******NON REMOTE KEYS******************

-Non flip non remote key (sometimes with light). They have no remote so can be used to all cars . Obviously they contain transponder and all above transponder information's apply to those keys.

Hope this guide explains most "key" questions.
If there is something described not clear enough - please let me know and I'll do my best to improve it.
 

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Discussion Starter #11
So according to this info i should:
1. get a transponder with uncut key
1K0 959 753 = 1K0 959 753 G ->> 3 button 434 MHZ (square shaped remote), 2004 - 2011 (CAN-BUS cars)
2004/5 - 2007 - CAN-BUS megamos crypto 48 transponder which are pre-coded to brand -> VW or AUDI or SEAT or SKODA.
That's ID48 i guess like this ebay item:
3 Button Flip Key Keyless Entry 434 MHZ 1K0 959 753 G for VW With ID48 Chip | eBay

2. Dump the ecu using the tool here: ME7 EEPROM programmer
3. use a Hex editor to get the security code from the dump
4. Use VCDS to program the new key using the security code from step 3.

Will report back when done.
 

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Definitely need one of those in the shed at home... just in case!
 

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Discussion Starter #16
some additional info on this key mystery: (Buying New Keys For The Mk4 Golf \ Bora - Page 4 - FAQ Forum - uk-mkivs)

HLO IJO 959 753 A - All vw's from 1997 - 2000. HLO 1JO 959 753 N is usable and superceeds the older oval key used previously!

HLO 1J0 959 753 AG - vw golf's only 2000-2004. HLO 1JO 959 753 CT now superceeds the older part number hlo 1jo 959 753 AG.

HLO 1JO 959 753 AH - vw passat's/bora's generally. HLO IJO 959 753 DA superceeds the older AH.

HLO 1JO 959 753 CT - newer vw transporters vans. Also many of the newer vehicle's including the skoda/seat's (SUPERCEEDS THE AG)

HLO 1JO 959 753 DA - vw polo's and some vw passat's. Also compatable with other models (skoda/seat's)

HLO 1J0 959 753 G - vw caddy vans
. Now widely in use on a number of
vehicle's as also superceeds HLO 1K0 959 753

HLO 1KO 959 753 - vw golf's/touran 2004 onwards. Now superceeded by the HLO 1KO 959 753 G

7M3 959 753 - vw,s sharan's,alhambras, etc only. Now superceeded by the 7M3 959 753 F

HLO 2EO 959 753 A - vw/merc crafter vans etc only
 

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Discussion Starter #17
The key I have is: 3D0 959 753 AD. 433MHZ. Not sure the one I ordered (1K0 959 753 G 434 Mhz) will work.
 

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I'm in the same boat...except I'm trying to hunt down a Continental 3D0 959 753 A P ( 315 MHz) foy my 2006 Touareg, but the closest I can find is Siemens 3D0 959 753 A P... can anyone chime in if these would be compatible? I did try a 3D0 959 753 O (Siemens 315MHz) and it would't take the programming :(

 

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Discussion Starter #19
So I did some more googling and searching and found out that Touareg 1 (2002 to 2010) use the phillips transponder pfc7936 also referred to as chip ID46.
I opened the only key I have and found that it is using chip pfc7946, un upgraded version of the pfc7946. The Touareg remote uses a pcb circuit which comes in one piece unlike some of the other vw cars which have a two parts key fob where the transponder (chip ID48) is on the key side and pcb is on the other side.
So the key I ordered is ID48 and is not compatible. I did cut it and it opens the door so that makes a valet key just in case :)
I ordered another pfc7946 key on Aliexpress for 16$ and a Shell/case for the old key. Carefull about the internal design as the pcb will not go into some available shells.
Pics and more fun coming.
 
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