F10 EGR Actuator Position Sensor Open or Short Circuit

[HOV]

I possess a 2011 F10 520D 5 Series vehicle. I require assistance with certain fault codes; I have reset the faults but cannot maintain the Engine Management Light in an off state.

I utilised ISTA+ and the fault codes obtained are as follows:


EGR Valve - 257E00 - Exhaust gas recirculation actuator, position sensor, signal: Open or short-circuit to ground
Diesel particle filter - 244800 - Information - particulate filter system: Restricted remaining capacity of particulate filter
Preheating Control - 242200 - Activation of Preheater Plug, Cylinder 1: Preheater plug resistance exceeds specifications
Exhaust gas pressure sensor - 25C800 - Exhaust back pressure sensor located upstream of the diesel particulate filter: Sensor deviation beyond acceptable limits

I replaced the EGR valve and attempted to reset the adaptations, but was unable to do so using ISTA+ for some reason.

The exhaust gas pressure sensor is a recent defect, following the EGR replacement, and the preheating control is also new.

I have conducted an extensive motorway drive to clear the DPF, but I am still unable to resolve the condition.

[DMGRS]

Which brand of EGR have you installed? Have you removed the plastic cover to ascertain if it operates smoothly? It is also advisable to examine the plug, as I have encountered instances of damaged pins.

The DPF indicates that the DOF has reached the end of its operational life, as per BMW's assessment; it is merely a software feature activated at a specific mileage threshold. You can resolve that by indicating that the DPF is new using diagnostics.


It appears that the glow plug in cylinder one has failed.

The DPF sensor may be functioning accurately, however the EGR valve could be partially open when it should not be, resulting in a decrease in exhaust pressure.

[HOV]

Thank you for your response, DMGRS. The EGR I installed was marketed as a brand new authentic part. They are dispatching a replacement for me to install; we shall see if that resolves the issue.

I removed the plastic cover, which was adhered, applied WD40 to release it, still the issue persists.


Is the plug you are referring to the one on the EGR, or is it a different plug?

If I can rectify the EGR issue, I anticipate that the DPF problem will resolve, as it has persisted shortly after the EGR malfunction.

I have inspected the glow plug in cylinder one, and it is functioning properly; yet, a malfunction persists.

I removed the plugs, injectors, etc., to replace the rocker cover, and it has been since that time that the glow plug defect has emerged.

Thank you in advance.

[DMGRS]

The DPF fault is merely coincidental; it activated thereafter and will remain an active information code until the vehicle is informed that the DPF has been replaced.

Indeed, the connection to the valve is the component that requires inspection.


What is the resistance of the glow plug, and have you verified that the wiring to it has not been obstructed during the rocker cover installation?

[DMGRS]

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