When a workshop tells you your diesel particulate filter is blocked, the next question is always the same: do I clean it or replace it? The answer has a big impact on your wallet.
The cost of a new DPF
A brand-new DPF is one of the most expensive parts on a modern diesel. Depending on the make and model, a replacement filter fitted can run anywhere from $3,000 to $7,000 — and for some European and luxury vehicles, even more. That’s because the filter contains precious-metal catalysts and is specific to each engine.
The cost of professional cleaning
A professional off-car DPF clean typically starts from around $500. The process removes the soot and ash that a new filter wouldn’t have anyway, restoring airflow and efficiency to near-original levels.
For the vast majority of blocked filters, cleaning achieves the same end result — a free-flowing DPF — at a fraction of the price.
When cleaning is the right choice
Cleaning is the best option when the filter is simply clogged with soot and ash. This covers most blockages, especially those caused by:
- Lots of short, stop-start city trips
- Interrupted regeneration cycles
- General build-up over years and high kilometres
When you genuinely need a new DPF
Replacement is only necessary when the filter is physically damaged — for example:
- A cracked or melted ceramic substrate (often from running too hot during a forced regen)
- Internal collapse of the honeycomb structure
- Contamination from the wrong oil or fuel additives
A good workshop will test the filter and tell you honestly which category yours falls into.
The smart approach
Before agreeing to an expensive new DPF, always get the filter assessed for cleaning first. We flow-test every DPF before and after cleaning, so you can see the actual result rather than taking it on faith.
In short: clean first, replace only if you must. It’s the difference between a few hundred dollars and several thousand.
Request a free quote or call 02 9667 4008 and we’ll let you know whether your DPF can be saved.