Please could you tell me where the amobilizer is kept on my car

Our datbase does not have any information for your vehicle so I am not able to get any details i=on the immobilizer.

First of all, are you sure it is equipped with immobilizer? Is there a green key on dash or a security light (usually red LED ) that is blinking while cranking?

What makes you think it is the immobilizer that is at fault?
For vehicles equipped with immobi;lizer, it could be factory or after market and if factory, the key should have a transponder within. If it is after market, you would have a separate black tube or rectangular piece usually held together with the ignition key.