What is a DPF and What to check when replacing.

Diesel Particulate Filter
3 Feb 2016

What is a Diesel Particulate Filter (DPF) ?

A Diesel Particulate Filter (DPF) is a device designed to remove diesel particulate matter or soot from the exhaust. Unlike a Catalytic Converter, a DPF is not a flow through device. Exhaust gases are cleaned by passing through the walls of the DPF leaving particulate matter to accumulate on the inlet face of the DPF. Once the DPF reaches a certain level it must be cleaned. Through filter “regeneration” these soot particles are burnt off at high temperatures.


Advice for DPF care

– When the DPF warning light illuminates you must follow the instructions in the owners manual immediately. Failure to comply could lead to a blocked DPF.

– Active DPF’s that use an additive fluid to assist in the regeneration process must never be driven without this fluid, as this could lead to a blocked DPF.

– When fitting a new active DPF or topping up the additive, the control unit must be reset to New DPF / Refilled Additive. (See Zetti DPF Tool section)


– It is not advisable to run a DPF vehicle on biodiesel.

– Always check the engine oil for diesel contamination, which can occur during the regeneration process. If the oil is contaminated then the engine oil and filter must be replaced.

What to check when replacing the DPF

Follow these steps when replacing a DPF:
  1. Ensure the root cause of the problem is rectified before replacing a DPF
  2. Use new mounting brackets
  3. Line up the DPF perfectly to avoid vibrations or anomalies in exhaust pressure
  4. Don’t hit the DPF with hammers or other rigid tools to avoid the monolith from breaking
  5. Do not use exhaust paste on the DPF
  6. Replace the engine oil of the vehicle
  7. Update the engine management software to tell the vehicle it has a new DPF fitted. (See Zetti DPF Tool article)


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