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Hello and Welcome -
My name is MIKE..
From your descripton - you have an immobilser issue.
Try your spare key / fob in case of a fault with your main fob...
If that works then thats what it is -
If not- then you have a fault on the car side of things - and Im sorry, but with this - you will need garage help - because it needs to be connected to test equipment to diagnose / fix the issue.
Tips for ref - - dont have unnecessery and def not , magnetic items on your key ring. Dont leave your keys near strong magnets - speakers - microwaves etc - this all disrupts the electronics.
Let me know how you go..and / or let me know if you need anything further on this..~~~>>>>>>~ Meanwhile now - Please do click on the "Exc / Ok rating" for me at this time.. Thank you in advance for that . ..Note that you can get back to me anytime at all after doing the rating - it doesn't close you out -- Best Rgds, MIKE.