What's an OPF

How do we define an OPF

An OPF is an On-Board Particulate Filter emissions device used to filter particulate matter from the exhaust gasses of a petrol engine.

In simpler terms, it’s part of the exhaust system that helps to keep the surrounding air cleaner by filtering out all those microscopic bits of soot and carbon that would otherwise be emitted into the atmosphere during normal driving.

An OPF consists of several components, the filter itself being one of them, which has to be replaced regularly depending on your driving habits and the filter’s service life.

OPF or petrol particulate filters

An OPF is a clever little device that prevents your car from releasing particulate matter into the air during engine combustion.

To comply with European Union (EU) standards, petrol engines are required to limit particulate matter emissions to less than 15 mg/km. 

Unfortunately, without proper filtering technology, cars often fail to meet these regulations.

Over 90% of new cars sold in Europe today come equipped with some form of OPF; however, older models continue to emit dangerous levels of particles due to their lack of compliance - prompting some countries to require certain vehicles to be retrofitted in order for them to be roadworthy again.

How does an OPF work

An OPF is a device that removes solid particles (for example, soot) thereby reducing particulate matter escaping into the environment.

Particulate filters usually sit downstream of the catalytic converters, typically located inside a section of the exhaust that can appear to be an extra silencer. Inside you’ll find a ceramic honeycomb structure, in the same way as with a DPF (diesel particulate filter).

They are not particularly effective at reducing overall pollution from cars; only particulate matter (dust, dirt and soot). and might cause higher fuel consumption.

Does an OPF require regular maintenance

When compared to diesel particulate filters they do offer some advantages to the vehicle owner. DPF's have a reputation for getting blocked over time, especially on vehicles that mostly do shorter, lower-speed journeys. 

With OPFs, it isn’t as much of an issue. Higher petrol engine and exhaust temperatures make them more effective at burning deposits off, plus petrol engines tend to emit lower volumes of particulates.

On a negative point, research shows that petrol engines can be just as bad as diesel units when it comes to nanoparticles, which are 100 times small than the diesel particulates (10 microns across). As they’re so much smaller, it’s thought they can go deeper into your lungs, which of course isn't good.

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I went for a remap on my T5 as it had an awful flat spot around 2800 rev's I got great personal service and its like having a new engine in the van smooth power and greater economy.... Highly recommended wish I'd done it months ago it would have paid for it self already thanks a lot hills are no longer a drag.

Adrian McManus

Popped in to see Mike on Friday to have my A4 2.0TDi 170hp remapped. Have to say I was a little pessimistic at first having being told by another firm that remaps on these were a nightmare so was expecting the worst! Thankfully, nothing of the sort, straight in, one error message unknown but Mike worked it out and all done in no time. Straight out for a test run and the drive is very different, certainly mid ranged (where these engines seem to suffer) pulls away nicely and can definitely feel the benefit. Best money I've ever spent on a car in, well, forever! Thanks again Mike

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Took my Civic Mk VIII 2.2 CDTI to Mike following a recommendation from a friend who's had his last few cars remapped at MPG., professional service and answered any questions I had. Customised remap that gave me a good balance between performance and economy. Mike was happy to let me watch the whole procedure and explained what he was doing. Makes a good brew as well! Would highly recommend, Will definitely bring my future motors here.

Dan Wright

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Had my Astra 1.9cdti remapped here with EGR delete for a great price, I have now got the full power and yes it's rapid lol.... Mike was helpful and talked me through it all and also good after care as well. Thanks again.

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I had my car remap done and I'm really pleased with MPG Tuning. Great atmosphere, great service and I will recommend it to all my friends. Thank you once again. Renault Megane 2.0 Turbo petrol with 165 hp standard

David Wojtasik

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Mike remapped my car. Perfect professional service from start to the end. For less than 2 hours everything was done. If you want a different feeling when you are driving MPG Tuning is your place to go.

Dimitar Dimitrov

My boyfriend has exactly the same car as me 1.5 diesel fiesta, had his remapped and was over the moon with it. I had never thought of having a car remap but after driving his, mine felt heavy and slow so decided to get mine done too, now I am converted I love it even more and I am getting about 80-90 miles per tank better than before, very happy , great friendly service and awesome cuppa while we waited

Kelly Williams

Had my renault van remapped at mpg tuning, awesome power, can now keep up with pigeons, thanks Mike for an excellent job 👍👍



Our lead technician has over 16 years’ experience in the tuning industry and long term connections with some of the Worlds most experienced data programming and tuning specialists. We are extremely passionate about our customer satisfaction and strive for a perfect result every time.

Contact MPG Tuning today to discuss options for a professional ECU remap or Call Us: 01543 466 662