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Open the key fob and see what battery it contains.
CR2032
use the key
what is the replacement battery for a 2003 Honda accord key fob
Does it not have a key lock on the trunk lid.
The ignition key has a transponder in it. Without the dealer programming the transponder, the key will not start the car. You can get a key made at your local Jaguar dealership for about $85 including the necessary programming. Some automotive locksmiths provide this service. I am an automotive locksmith and I cut and program the keys that you speak of.
Read the owners manual that came with the car. Key battery replacement details are in there.
pop it open, two batteries + side down
cr2016
Open it up and see what battery it takes.
When fitting a new battery for a 1996 Jaguar XKR, you can reset the alarm by placing the key into the ignition. Turn the key halfway and leave it this way for five to 10 minutes before starting the car.