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The Mazda engine control unit (ECU) with part number LFG5 18 881B is a direct replacement for a 2005 Mazda 3 model. This ECU is an OE Spec component, meaning it meets original equipment specifications for optimal performance. It requires programming upon installation and comes with a 90-day manufacturer warranty for added assurance. This ECU is designed specifically for the Mazda3 and is not a universal fitment product.