Typically, the “engine power reduced” warning light on your dash means that your vehicle's performance has been reduced to avoid damaging its engine. The computer in your car, also known as its “electronic control unit” (ECU) has triggered the Reduced Power Mode after it has detected a system failure.
Engine power reduce is not a automotive term I've heard of but you would have to tell me what's going on with your car so I can give you better advice on what to do or what could be the problem.
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