In the right front strut area, my 06 has a Jag Dealer Factory Modification sticker labeled J004. I checked and it seems to be an ECM (maybe TCM) reflash to better control evaporative loss. Is that everything? Any performance or shift benefits? Recent purchase and just getting the car sorted out. So far so good. Definitely a very different car from my 2000.

 

https://www.jaguarforums.com/forum/x...ll-j004-10665/

 

Thanks. I did look it up. Conclusion is the only benefits are emissions related. Just curious.