It was January of 2017 when the pump injection engine VW Passat 2.0 drove up to the AUTOMOTO workshop in the Thuringian town of Hildburghausen. The vehicle did start during the initial inspection, but the engine would stop again just a short time later. The workshop discovered the cause quickly: Because of damage to the camshaft, the diesel particle filter had become so extremely clogged that it was not letting anymore air through. The earlier defect caused a large amount of oil to get into the fuel system over time, which was burned along with the diesel, generating a lot of carbon black.
The professionals at AUTOMOTO selected the PRO-TEC DPF/Catalyst Cleaner to correct the problem. The first step was to remove the hose from the differential pressure sensor so the motor would not cut out again right after starting. Then, they sprayed the cleaner over the whole diesel particle filter through this access point. This worked well since the product starts off as a liquid, then becomes a foam. Afterward, they re-connected the hose and the vehicle idled for 15 minutes. Over time, they could see that more and more air was coming out of the exhaust.
A subsequent test run emptied out the diesel particle filter even more, and they were able to start forced regeneration. At the end of the day, the Passat had been completely repaired without extensive disassembly work and in just a short time. The customer, of course, was extremely happy about the excellent cost savings.