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Blimey Hunter mate you enjoy a challenge then???? First step is to purchase a OBD2 system and the best one is the American system VCDS, and start to get an idea of the error messages. The idea is then to clear them (cos they stay in the ECUs memory) and then when the car runs, see which of them return. Note also that the new battery MAY need to be programmed to your car, you can do that with VCDS too. GOOD LUCK!!!
 

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Excellent point Sayek mate and let me guess......no.
 
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