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Diesel Particulate Filters (DPF) And How They Work

If you follow an old diesel vehicle that's accelerating away, you know what’ll happen – a small black cloud of soot will puff out of the exhaust. That'll soon be a thing of the past though because, thanks to their new DPF technology, modern diesel vehicles are cleaner than ever before.
What is a Diesel Particulate Filter?

The DPF is a filtration system, located within the exhaust system, which filters out harmful soot particles from the exhaust gases. The maintenance-free filter normally consists of a silicon carbide core, perforated by microscopic channels. The exhaust gas passes through the channel walls, on which the particulates collect.
Does the DPF need changing regularly, like an air filter?

No, the DPF is entirely self-cleaning, a process which is controlled by the engine management system and pressure and temperature sensors which detect when the filter must be cleaned.

The exhaust temperature is then increased by deliberate multiple fuel injections into the engine, raising the temperature of the DPF to 600°C, which burns the soot particles without leaving any residue.

The regeneration process takes place periodically, under normal driving conditions, without the driver noticing that it’s in progress. Vehicles that spend much of their time on short trips or in urban environments may require a longer journey at higher speeds to complete the regeneration cycle – in these instances a dashboard reminder light will inform the driver when this is required.

If the driver ignores the warning light and waits too long to operate the vehicle at a higher speed over a longer distance, the DPF may not regenerate properly. If this continues it can damage the DPF completely, meaning it will need to be replaced at an authorised garage.

If you think the Diesel Particulate Filter in your vehicle is damaged and needs replacing visit or call your nearest Pentagon Service Centre for advice.
How does the DPF in my vehicle work?

Upon entering the DPF (1) the exhaust gases are directed through the silicon carbide core (2) before being allowed to continue through the exhaust system.

The construction of the core (3) offers a large surface area to the passing exhaust gases, giving a plentiful storage volume for collected soot.

The soot volumes are monitored at all times by pressure and temperature sensors (4/5), which feed information to the engine management system to determine when the filter requires regeneration.

When the soot levels (6) have reached their allowed limit, the regeneration process is initiated (7), in which the exhaust gas temperature is raised to 600°C, by multiple fuel injections, in order to burn off the soot particles.

Contact Your Local Pentagon Service Centre

Pentagon

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Representative Finance Example

APR Representative 8.9%

Cash Price £8,995

Deposit £181.00

1st Monthly Payment £181.06

58 Monthly Payment £181.06

Final Monthly Payment £182.06

Amount of Credit £8,814.00

Total Amount Payable £11,045.00

Total Charge for Credit £2,049.60

Fixed Interest per Annum 4.65%

Duration 60 Months

© 2021 Pentagon Motor Group is a division of Motus Group (UK) Limited
© 21st Century Internet Ltd

© Pentagon Motor Group is a division of Motus Group (UK) Limited. Motus, Oakingham House, Ground Floor, West Wing, London Road, Loudwater, High Wycombe, Bucks, HP11 1JU. Registered in England and Wales, Number: 653665. VAT Registration Number: GB880984866. ICO Data Protection Registration Number: Z6033829.

Representative Hire Purchase Finance Example
Cash Price	Deposit	1st Monthly Payment	58 Monthly Payment	Final Monthly Payment	Amount Of Credit	Total Amount Payable	Total Charge For Credit	Fixed Rate Of Interest Per Annum	Duration
£8,995	£181.00	£181.06	£181.06	£182.06	£8,814.00	£11,045.00	£2,049.60	4.65%	60 Months
8.9% APR Representative

The first payment includes a £0 initial acceptance fee and the final payment includes a £1 option to purchase fee. Pentagon is a credit broker and not a lender. The APR in this example is representative of the whole website and includes manufacturer supported offers and standard finance rates. At least 51% of customers agreements arranged through Pentagon are at or below the representative APR shown.

Selected new car and van prices that are shown may apply to pre-registered vehicles in stock with delivery miles only. Demonstrator vehicles may show an estimated mileage based on the age of the vehicle as they are still in use. Although we aim for this to be accurate within the last 31 days, please check with the dealership before considering your purchase.

Pentagon Motor Group is a division of Motus Group (UK) Limited which is authorised and regulated by the Financial Conduct Authority to act as a credit broker and not a lender (FCA number is 680108), sourcing credit to assist our customers' purchases from a carefully selected panel of lenders. For a list of these lenders please click here. Lenders may pay us a fee for these introductions. A guarantor may be required. If you choose vehicle finance you will not own the vehicle until all payments are made. Applicants must be 18 years or over. Finance acceptance and interest rate is subject to status.

For the sale of general insurance Motus Group (UK) Ltd is an Appointed Representative of Automotive Compliance Ltd, which is authorised and regulated by the Financial Conduct Authority (FCA No 497010). Automotive Compliance Ltd’s permissions as a Principal Firm allows Motus Group (UK) Ltd to act as an agent on behalf of the insurer for insurance distribution activities only.

0333 numbers cost 2.5p per minute from a standard BT landline which is the same as if you were calling an 01 or 02 number and is usually included within your mobile contract minutes (where applicable). 0800 calls are free from a standard BT landline. Calls from other networks and mobiles may vary. As part of our ongoing commitment to improving the service we offer Motus Group UK customers, calls may be recorded for marketing and training purposes. These recordings are retained for 30 days, at which point they are deleted and cannot be retrieved. If you would prefer that we do not record your call, please inform the member of staff that you are speaking to who will suspend call recording for the duration of your conversation. Similarly, if at any point during the call you wish to stop the recording, please inform the member of staff you are speaking to. Vehicles and images are shown for illustration purposes only. Fuel consumption information is official government environmental data, tested in accordance with the relevant EU directive. Official EU-regulated test data is provided for comparison purposes and actual performance will depend on driving style, road conditions and other non-technical factors.

Price changes

The quoted price is subject to taxes, import duties, levies and/or government charges. Any changes to these charges are outside of the control of Motus Group (UK) Limited and will be passed through to you in the final invoice.

Any changes to the vehicle cost price from our manufacturer (e.g. as a result of currency exchange movements) will be passed through to you in the final invoice. Should there be any changes to the invoiced price we will notify you as soon as we are aware. You are able to cancel the contract without penalty up to 7 days after receipt of the price notification.