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Rubytuesday

Engine management light on , why ? Yes had diagnostic had the all clear ,

since been told it can be quite common in motorhomes that have been standing especially over winter , it came on last year but after running it for about 50 miles went off and stayed off.  It has now come back on so took it for testing but have had the all
clear again , has anyone else had similar problem or got any ideas what it could be ?