Hi, my 2006 Forester is totally immobilsed.

Been off road for a couple of months, and was turning it over until the very cold snap a few weeks ago, battery died. It needs to go for MOT but will move on to my property and SORN (not an issue).

Car is immobilised but I can gain entry by key. Central locking does not work remotely by fob.

Ive put a brand new car battery in. The car was completely without power for a few weeks. New batteries in both original fobs. Windows and lights work.

On insertion of key in ignition, indicators flash rapidly and alarm will trigger after 30 seconds, can only turn off alarm by turning off ignition.

I have original silver key code stickers. The code might have been changed by previous owner - I had no need to use before battery change.

I believe the alarm is a Thatcham sigma system with the multifunction keypad and i have original Subaru paperwork including ECU serial no.

Its a second vehicle bought because of memories of another Forester years before and has generally been reliable, and body is in great condition as is interior but probably not worth a lot, and nothing in current state so I just need to understand costs to balance whether it is economically viable to fix this issue before I start other work - and how to/what do I do next?

Local-ish auto locksmith doesnt want to touch Subaru and another wont give any estimate before arrival. Im in a town with no nearby Subaru specialist.

Can you advise how to reset keyfobs/code to immobiliser and alarm / solve the problem?

Thanks in advance.

If it were me I would try every sequence in turn and ensure that I am sat in the drivers seat with all doors and boot/bonnet closed.
Sometimes its a case of trying different variables and seeing if the outcome changes
Please let us know how you get on with it all