EML = Engine Management Light, when a euro4 mk3 Mondeo has the EGR (Exhaust Gas Recirculation) valve blanked with a solid plate, the EML may go on, (because the ECU (Engine Conlrol Unit) detects lack of flow ard thinks the EGR is faulty) but it can be reset with a OBD11 fault code reader (about £22 online)


And euro 3 Mondeos can have EGR blanking plates fitted with no problem


Plates with holes in them are a waste of time (defeats the purpose)

A solid blanking plare can "fix" a faulty / jammed EGR valve, (becauese it disables it) the EGR valve must be working properly to fit one with a hole