Hi guys I've an intermittent fault with my 2011 xfs whereby it won't start at times. Fault code c3f40-4a comes up on my scanner but I'm struggling to find any information on sorting this problem. I know its to do with the immobilizer. Can anyone steer me in the right direction please?

Thanks, Ray

 

I would use a different scanner as that code is not in the normal format?
With what your working on I think you need to get the car scanned with SDD.

Have you looked at the sticky thread in general tech help? It has a bunch of after market scanners mentioned?
Note you did not tell us what scanner your using?
Post complete car details? What engine? How many miles? What have you done so far? How long have you been fighting this?
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problem materialised approx 3 weeks ago but has been intermittent where car wouldn't start first, second or third times. Once I cleared the code mentioned above the car starts no bother or if the car was left for 20 mins it would start without having to clear the code.

The car is 2011 3D XFS 116k miles
I'm using an Xtool D7 scanner

 

OK thanks for the added info!
One problem is you have a Diesel so you must not be in the US?
We are mainly a US based forum and have zero experience with them.

BUT the UK forum is very deep in Diesels and will probably give you better answers?
Take a look;
UK Jaguar Forum
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