start by getting the codes read this might point you to the cause of your dpf problems they are a complex system where multiple components work together to regen the particulate filter . some possible causes are pressure sensor or any of the pipes linking the sensor egr problem ,glow plugs,. temp sensor. second hand blocked dpf will have little or no value .there are companys that will come round and diagnose dpf problems if your not to good with test equipment and tools. good luck with your new car
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