1990 Ford Truck Emmisions Shop Manual.
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P0404 = EGR Range/Performance Problem
👉 The ECU detected that the EGR valve is not operating within expected limits.
Este manual de reparos fornece informações técnicas sobre o sistema de injeção Bendix utilizado em veículos Renault, incluindo suas características, componentes e procedimentos de diagnóstico.
P0403 = EGR Control Circuit Malfunction
👉 This code means the engine control unit (ECU) has detected a problem in the electrical circuit that controls the EGR valve.
Este manual describe las características y funcionamiento del Renault Duster. Explica los sistemas de seguridad como cinturones, airbags y asientos para niños. También cubre temas como llaves, puertas, retrovisores, testigos y equipamiento de confort.
P0402 = Exhaust Gas Recirculation Flow Excessive Detected
This means the engine computer has detected too much exhaust gas entering the intake system.
👉 In simple terms:
The EGR valve is allowing more flow than expected, usually because it is stuck open or not controlled properly.