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Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.
Hey how are you
if the security light comes back on in 5 secs ,the anti theft module not recognizing the key ?
was that used ECU , ? and if it was ,did you program the keys bacj in it using Subaru scanner or equivalent ?
do you have a capable scanner to retrieve fault codes from car module ?
lets start here ?
Please let me know
ASE Certified Technician