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Hello Kevin, If it is indeed the original battery, then you can almost guarantee it will be on or near to, it’s last legs. If you do decide to change it, my advice would be to buy once and wisely - e.g. Varta/ Bosch with their 5 year guarantee grade. On-line suppliers include Tayna and Battety Megastore etc. - there are more, who usually offer beer value for money than who you will buy locally. It’s likely the new battery will have to be coded to the car. Kind regards, Gareth. p.s. Apologies- overlapped Steve’s reply,

Hi Kev the battery if knackered will cause all sorts of problems and yes its in the boot, rule of thumb is never replace any part based on a U code and the other question is has the gearbox ever had a service, the problem with Delphi software is its a shade vague on descriptions of faults but intermittent looks very much like the battery, if you get a new one regardless of make it must match the original unit in every specification, physical size and cranking amps etc and it will need to be coded to the car or you will kill the new unit in record time. Steve.

Original battery Kevin? If so, my starting point would be to first eliminate the battery condition as influencing the problems. Kind regards, Gareth.