Warning lights

DPF warning light on

The DPF light means soot has built up beyond the level the system is happy with. Whether a drive will clear it depends on why it built up.

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Symptoms drivers describe

DPF or exhaust warning light, often after short journeys
Loss of power or limp mode
Cooling fans running hard and a hot smell after driving
Rising fuel consumption
Engine oil level creeping up

Possible causes

A driving pattern with no sustained runs to complete regenerations
EGR faults putting excess soot into the filter
Injector condition affecting combustion
Faulty pressure or temperature sensors
Ash loading at the end of the filter's life
Incorrect or degraded engine oil specification

What you can do

Do not keep driving in limp mode hoping it clears
Note whether the oil level has risen — it can indicate failed regenerations
Have the cause diagnosed before paying for cleaning or replacement

How we check it in the workshop

We read soot and ash values, differential pressure, exhaust temperatures and regeneration history, and check EGR and injector data before recommending anything.

Is it safe to keep driving?

Book it in soon. Early action often means diagnosis and a regeneration; leaving it can push the job towards cleaning or replacement.

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Related repairs

How we can help

DPF DiagnosticsA DPF warning is the end of a chain of events, not the start. Finding out why the filter is loading up is the part that saves money.Read more DPF RegenerationRegeneration burns accumulated soot out of the filter. It is effective when the filter and the engine are in a fit state — and pointless when they are not.Read more Diesel DiagnosticsModern diesels combine high-pressure fuelling, turbocharging, exhaust gas recirculation and after-treatment. When one part of that system drifts, the symptoms usually show up somewhere else.Read more EGR Valve Repair & ReplacementThe EGR system recirculates a measured amount of exhaust gas back into the engine. When it sticks, everything downstream suffers — including the DPF.Read more

Helpful reading

Go deeper on this fault

Signs your DPF is blocking upA DPF rarely blocks without warning. These are the signs worth acting on before it becomes a replacement.Read more DPF cleaning or replacement — which do you need?Cleaning a filter that blocked for a mechanical reason just buys time. Start with why it blocked.Read more

Warning lights

Other symptoms in this group

Battery warning light on while drivingThe red battery symbol is a charging-system warning. The engine is normally running on stored battery power only, which is limited.Read more Engine management light flashingA steady amber light and a flashing one are very different. Flashing normally indicates a misfire severe enough to risk expensive damage.Read more Glow plug (coil) light flashing on a dieselOn many diesels the coil symbol doubles as an engine fault warning. A flashing light usually means a stored fault, not necessarily a glow plug.Read more ABS warning light onWith the ABS light on, the anti-lock function has typically disabled itself. The brakes usually still work, but without anti-lock support in an emergency stop.Read more Brake warning light onThe brake warning light covers several different systems, so the first job is establishing which one has triggered it.Read more Airbag warning light onThe airbag light means the restraint system has logged a fault and may not deploy correctly, so it is worth reading properly rather than clearing.Read more

Want this looked at properly?

Send us your registration and describe the symptoms — we will tell you what the next step is.

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