Engine warning light help.

Drove 120 miles to ipswich yesterday everything ok, came back to car 4 hours later started the engine and the amber engine warning light came on the dashboard, it is not flashing and car drove back ok. Is this something a main dealer needs to look at only i do not have one anywhere near me or can this be looked with a diagnostics mechanic, anyone else had this and what sort of problems can this normally indicate.Hoping something simple just spent £400 on new exhaust system this week.

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