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Since you have not had the vehicle long, remove the earth straps and cables and clean the connections. Add a couple of earths between the chassis and body as well. You never know, it may clear the fault, if you are lucky.
being not that mechanically minded, would the earth straps / cables be listed in the owners manual, are they hard to locate etc, I've tried google and theres a little bit there that may steer me in the right direction...