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Peugeot 307: The overloaded DPF
A twelve-year-old Peugeot 307 suddenly suffers from an inexplicable loss of power - like the victim of an insidious poison attack. In the workshop they think they have quickly found the problem, but this soon turns out to be a mistake.
Peugeot 307: The overloaded DPF
The compact Frenchman, built in 2005, only has 134,000 kilometers under its belt and, thanks to good care and regular services, is far from being worn out. This makes it all the more painful for the vehicle owner when one day his car is affected by a strange tiredness and lack of motivation. The warning lights up on the dashboard that the particulate filter is clogged.
In addition to the symptoms, there is also an excessive thirst for the diesel additive that is automatically added to the fuel for the purpose of filter regeneration. A visit to the workshop therefore becomes unavoidable and another diagnostic mystery begins.
▶ The check shows that the DPF is heavily loaded with soot. The regeneration phase is therefore initiated manually.
▶ The error entry is then deleted and the oil is changed. The problem seems to have been resolved.
▶ A short time later the Peugeot is brought back to the workshop with the same symptoms. This time the DPF is removed and cleaned manually. The entire system is then checked. Conclusion: no further defects to be found.
▶ A few days later, the Peugeot is brought into the workshop for the third time by its now somewhat annoyed owner. This time, the automotive technicians are also taking a closer look at the diesel additive system in addition to the injection system. The AVL Ditest MDS 188 with the XDS 1000 software on board is used as a diagnostic device.
▶ After carefully checking the list of measured values, a message appears on the screen that finally puts the workshop detectives on the right track: The system reports that the tank cap is open, but this is apparently not the case.
▶ The sensor located in the fuel filler neck is obviously defective and constantly indicates that the fuel cap is open. The result: The whole system goes crazy and injects too much additive for regeneration, which puts a lot of strain on the DPF.
▶ The automotive technicians replace the sensor, delete the displayed error, and the Peugeot works perfectly again. Case solved.