Pektron immobilizer sounding

My Pektron Immobilizer keeps beeping ever since i unlocked the car with the fob with it the other night, left the fob in the house and started it with the key.



Now it sounds every time i put the keys in the ignition, i have to push unlock again to switch off the immobilizer to get her to start.



I put a new Duracell battery in the fob last night in case this was the problem, nope still the same.



Thoughts?

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