Diagnostics

DPF Warning Or Blocked Filter

Find out why the DPF warning is on before cleaning or replacement is considered.
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Llandow workshop, South Wales customers

A blocked DPF is often a symptom

The DPF can block because the car cannot regenerate, because a sensor is lying, because another engine fault is creating soot or because the driving pattern never allows the system to complete its cycle.

We focus on legal, repair-first solutions: understand why the DPF warning is there, then advise on cleaning, repair or replacement only when the cause is clear.

Diagnostics

What happens next

You do not need to know the workshop term. Tell us the symptoms and we will explain whether the car needs servicing, fault-finding or repair work.

What we look at

  • DPF warning lights, limp mode, smoke, failed regeneration and repeat emissions faults.
  • Soot load, differential pressure, temperature and sensor plausibility checks.
  • Investigation of underlying engine, boost, EGR or fuelling causes.
  • Repair, cleaning or replacement advice only after the cause is understood.
If the problem points elsewhere

Other useful routes

DPF Repairs

This is often the better route when the symptoms, service history or inspection point in a different direction.

Read more

EGR fault, smoke or hesitation

This is often the better route when the symptoms, service history or inspection point in a different direction.

Read more

Engine light or poor running

This is often the better route when the symptoms, service history or inspection point in a different direction.

Read more
Not Sure What Is Wrong?

Tell us the symptoms and we will point you in the right direction.

If you are unsure whether the car needs servicing, fault-finding or repair work, start with the free first check.

Contact LT Servicing