To the best on my knowledge, the system changed in 2001, from the older Megamos 13 to the Megamos 48. My US '03 4.2L definitely needed the ID48. Might be several variants, too. I ordered an ID48 model compatible with VW as well. Make sure these are sold a new. If used, they can be locked with a "dealer code" for another brand. Used from Jaguar would probably work, though...

Why does it need to be replaced? To my knowledge, these devices are write-only, so all your keys (including valet!) will have to re-coded, so a good time to add spares if needed. Just curious.

 

 

I did the same a number of months ago. Pretty happy with the result. These ID48 are cheap on eBay. How do you plan to pair up this transponder to the car?

 

 

Are you saying that we can use specified for use in VW cars only,
can be used, for example in 2004 Jaguar?

 

The technology is developed/owned by a supplier company (Thales?) that sold this setup to several manufacturers, Jaguar and VW included. To avoid the awkwardness of a VW key being "worked" by the Jaguar software, one of the steps in the programming of the chip is to "lock" it with a "dealer" code, a basic password. To my knowledge, this dealer code is really a brand password, unique to VW or Jaguar. This is why you have to buy a chip sold as NEW, to be sure it is unlocked. If you want to buy a used chip, then it has to be specifically from a Jaguar (so the Jaguar software can unlock it). These chips are fairly cheap, you may have to just get one and try. Does your car call for the ID13 or ID48?

 

I think ID48
What is confusing me is this: ID48 T6 Crypto Unlocked Chip For VW /Audi /Seat /Skoda /Porsche

If it's unlocked then what difference does it make?

 

Should work, but you will have to get it to confirm. Searching for "Jaguar Megamos id48" comes up with hits with that T6 version. These are not expensive, and as sold unlocked, should be OK.