How old is it compared to its 30k miles? It may just need a new battery if it usually does cold starts and short trips. I just replaced the battery in my Grans 52 plate 24k miles A class Merc for the 3rd time for this reason. It kept having spurious warning lights about BAS etc because of a bad battery.
If there is a CEL on, there will also be a fault code, do you know what it is..
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