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my dear friend, there is not that much of worrying to be had. its a check engine warning light. not the engine failure light. just take your car to a local auto parts store. i'm not sure what one in the UK will do it. however there are auto parts stores that will scan your check engine light for free.
run to one of these places and ask them to scan it. once the scan has been done they will have some codes. have them check the codes in their computer. they can now offer possible problems, parts, and prices of parts, to fix your car from throwing a check engine code.
once this is done, you can begin the arduous task of testing which possible problem you are having. make sure to buy a repair manual with information according to your make model and year of car. refer to each problem. read up on what is needed to do everything. then start from the cheap/free problems, and work your way up to the more expensive ones. depending on what problem it is it can cost anywhere from about 2 dollars to fix all the way up to about 200. most check engine codes will refer you to an emission control unit.
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