The main components of EGR systems are EGR valves and EGR coolers. Exhaust gas recirculation ( EGR) is a NOx emission control technique applicable to a wide range of diesel engines from light-, medium- and heavy-duty diesel engines right up to two-stroke low-speed marine engines. Check for vacuum leaks, especially the elbow where the PCV plumbing connects to the throttle body, it is know to crack. If you had a bad EGR valve, first, the check-engine light SHOULD come on (but might not). If it wasn't working, you wouldn't have a bad idle, you'd more than likely have pinging. If it was leaking or stuck open, you might get When driving car and turning into a corner lights up ESP and ABS faults and it stays SOMETIMES (sometimes it doesn't light for like 300km, for couple weeks. Sometimes it lights up) When codes were read there was. C1235-AO RR Wheel Speed Sensor Input Signal lost. C11-44-A0 RR Tone Ring Tooth Missing. TL;DR: Bought brand new EGR valve to pass MOT after doing without one for the past year. Focus mk2.5 TDCi engine misfires at low RPM, medium load and goes limp. Runs perfect with EGR disconnected, but won't pass MOT like that. Have tried disconnecting battery to reset PCM and used Forscan reset learned values procedure with no joy. Hi guys and gals. At the weekend whilst the wife was driving from Suffolk to the Wirral the engine service now message came up and the car went into limp mode. When she got home I plugged my bluetooth reader / torque pro in and got the code PO42E, egr valve stuck open. I cleared the fault but it came back within a few hundred yards of driving. Ford EGR-ESM Diagnosis. The EGR system module (ESM) is one of Ford’s latest EGR system for gasoline engines. It is an EGR valve, EVR, MAP and DPFE sensor rolled into one package. Though the DPFE sensor on an ESM is referred to as “DPFE” by the scan tool and also wiring diagrams, it is not a traditional DPFE sensor as used on the older EGR The DPFE sensor is by the EGR valve, it will have one connector and two silicone hoses attached to it, the other ends of the hoses attaches to the EGR tube (from manifold to EGR valve). Verify both hoses are attached and not broken or split. Verify the connector is OK/properly connected, no pins are pushed out/no corrosion/water intrusion etc. DELPHI EG10591-12B1 EGR Valvewithout EGR cooler Article number: EG10591-12B1. (Submit a review) Product info: Supplementary Article / Supplementary Info: without EGR cooler. Item numberEG10591-12B1. Our price 120,42 £. 6zo8p4.