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My car had a similar but different problem with my taillights. The LEDs were a little too excited all the time. Unfortunately I had to go to the dealer. They ordered at least a new taillight, perhaps some kind of wiring harness too. They’ve had the car for 5 days so far so hopefully the end is near.
I wonder if this is going to be the start of another "my left-side LEDs are dead" series of problems, as we have seen with the DRL on the pre-MY21 LED front headlamps. I should probably go and check mine at some point (though it sailed through the service and UK MOT test in March)
That would certainly be interesting. I heard that the headlights for MY18-20 had a problem of either being too dim on one side or just flat dying on a whim. I'd definitely be intrigued to see if any other MY21's have this issue. I got nervous because this issue popped up as I was literally on the way home from buying the car lol it's sometimes comforting to know (in a cynical kind of way) that others are seeing the same issue.
Hopefully (crossing my fingers like mad here!) your two cars are the only ones, especially given that I also have a facelift car with the newer design rear lights. I have no doubt that should you ask your Jaguar dealer, you will be met with the response "Your car is the only one we've come across with this problem Sir"