Greetings, I wish to document my observations regarding a longstanding issue with the DPF on our Viano, in the hope that it may assist others.
Our Viano encountered a DPF problem almost two years ago. Possibly more; it became limp and was limited to 3,000. The scanner indicated a malfunction with the O2 sensor and that the DPF was 200% saturated. I replaced the sensor and removed the DPF for cleaning. Reconfigured everything. and rectified the errors. However, I was unable to extract it from Limp.
I examined every facet of the DPF system to ascertain if I overlooked anything, earnestly attempting (and likely failing) to refrain from indiscriminately replacing components. The scanner indicated that the boost sensor between the two turbos was absent. However, my engine, being the van model, is equipped with only one turbocharger. The back pressure sensor may be defective. I replaced the back pressure sensor without success; it subsequently became apparent that the Carsoft scanner was providing inaccurate information. I upgraded to a Mercedes Xentry laptop; subsequently, the prices decreased, and I sold the Carsoft.
The differential pressure sensor was replaced in the interim.
The MERC program provided real-time data from the DPF. This indicated to me that the DPF was unobstructed, with the exception of the simulation pressure.