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.