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4 digit code no longer working

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Hi folks, hope your all well and enjoying 2020.

I just returned from a trip away and was counting down the minutes to go for a relaxing drive in my beloved hatchback, unfortunately my Battery had died and I was unable to get out and about. I tried to start my lazy beast with a jump start which got my alarm going, so i pumped in my 4 code pin number expecting everything to calm down and allow me to start up but after entering the code not a damn thing changed. would a flat Battery not allow the system to recognize the pin code? Or have I damaged the ECU? I've now removed the Battery and got my trickle charger on it. Should I consider anew Battery

Appreciate any help folks. 

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Didnt think the pin code would be impacted by a jump start  - ECU possibly but not the alarm. You are def sure you are putting the right pin code in, not for your cashpoint card.

Once Battery charged try reconnecting and starting, being disconnected may have given it time to drain and reset any alarms


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