Car as no key fobs at all whats cost of sorting his out would it be cheaper to get a new alarm and me fit it because i dont know if alarm even works so could get new fobs and it still dont work

The alarm and immobiliser are separate systems. So I'd imagine it would be far simpler to replace with a new alarm unit.

looks good advice but even with new unit and key fobs i wont know if the sounder works until ive bought this, does alarm operate remote central locking too

Yes

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They are very helpful