DPF Deep-Clean & Regeneration

Your Diesel Particulate Filter (DPF) helps reduce harmful emissions, but over time it can clog up and cause your engine to run inefficiently. If you’ve got a DPF warning light or your car feels sluggish, contact NJB Motortech for free expert advice.

FREE ADVICE

Signs your DPF may be blocked

A blocked or full DPF commonly triggers a yellow warning light on the dashboard. You might also notice:

Reduced engine performance / poor acceleration
Increased fuel consumption
Engine struggling to rev freely
Warning messages related to emissions or DPF

If you’re unsure, give us a call, we’ll point you in the right direction.

How a blocked DPF is cleared

DPF cleaning usually involves regeneration, which burns off built-up soot.

In many cases, this can happen through driving:

Active regeneration: typically 10+ minutes at a higher, consistent speed
Passive regeneration: usually motorway speeds for up to an hour

Sometimes regeneration won’t complete (especially with short trips, stop-start driving, or existing faults). If the warning light won’t clear or performance has dropped, a professional deep-clean is often the best next step.

Professional DPF Deep-Clean

We don’t guess, we check the system properly, clean it thoroughly, then confirm results.

Our DPF service includes:

Pre-clean health check and investigation using engine diagnostics
Live data check to assess emission readings
Full deep-clean of the DPF using specialist cleaning chemicals
Post-clean diagnostics check plus a clear report of the results

Frequently Asked Questions

Where is the DPF located?

The DPF is located in the exhaust of a diesel car.

How often does a DPF regeneration occur?

The DPF will usually regenerate when it’s around 45% full, but how long it takes to reach this level will depend on your driving style.

How long does DPF regeneration take?

Passive regeneration will be automatically carried out if specific driving conditions are met.

Can a blocked DPF damage the engine?

ost cars will go into ‘limp mode’ to protect the engine if the DPF is blocked. This will limit the engine’s power and the car’s top speed to allow you to get off the road. Continuing to drive the car with a red DPF light on can cause damage to the engine by contaminating the engine with carbon deposits.

Can I remove the DPF?

No, removing the DPF is illegal…Your car will also fail its MOT without a DPF as the emissions will be too high.

Do I need a DPF to pass the MOT?

Yes. Since 2014, a DPF check has been part of the MOT test, and if it has been removed then that’s an automatic fail.

Book a DPF Deep-Clean today

Don’t ignore a DPF warning light, leaving it too long can lead to bigger issues and reduced efficiency.

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