Models: Engine applications fitted with a Diesel Particulate Filter (DPF) Symptoms: DPF fault codes present, DPF light illuminating or flashing, vehicle experiencing performance issues. Failure/Issue: Inability to clear DPF and related fault codes, performing DPF regenerations, misunderstanding of the DPF system and the diesel engine operation. Excessive and unnecessary DPF forced regenerations can cause additional … TB1087- DPF Diagnosis & Testing