What is the purpose of the EGR valve on a Ford Focus?
What is the purpose of the EGR valve on a Ford Focus? Ford Focus 1.6 TDCI - Blanking EGR valve and fault codes - Railroad. The purpose of the EGR system is to reduce NOx emissions, nothing else. The ECM knows whether or not the EGR valve is open by monitoring air flow via the MAF sensor. How to remove and inspect EGR valve Ford Duratec HE? Simple DIY how to: Remove, inspect, and replace the EGR (exhaust gas recirculation) valve on a Ford Duratec HE or Mazda LF engine. EGR valves get dirty over time along with the rest...