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Hello thanks for reading! I gotta beautiful 06 imp SS that I love and take such good care of! Anyways I think my 1200 amp and subs killed my battery. I took it to Sears and they tested the alternator battery and starter. alt and starter were good and they said my battery was shot. So i put in the most expensice optima, it was like 220 bucks yellow top. So they put that in and now it wont start at all!! It is sitting at sears now until they figure out what could be wrong. All the lights come on and gauges but when you go to to turn the key to start nothing, no clicking or nothing. Like i said headlights good gauges good door lock/unlock good, but the engine wont start! I seen some topics online and it looks like it could be sometype of passcode/lock issue. I dont know what to do, please help thank you
 

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Immobiliser

I am an ex mechanic who has experience with ECUs

I think that changing the battery in the car has made ur ECU think it's bein' broken into and has activated the immobiliser

A friend of mine had a similar problem with a 2004 BMW when he changed the head unit. He had to call BMW out and get a tech to reset the ECU
 
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