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I added engine flush to my engine for the 1st time before servicing 2wks ago(i.e. before draining the initial oil)but since that day my engine check light has been on. I even serviced the engine again yesterday(but this time, without adding the engine flush fluid)but the indicator refused to go off.although the Car is working fine, but i have a feeling that a danger is lurking around the corner - Please help...

Note;
When i say i service the engine, i mean below exercise are carried out; change of engine oil, oil filter, check ATF oil level, check air filter and fuel filter(change if required)  

Take it to autozone and use their scan tool to read the code. Then post it up