DPF symptoms and warning lights, what they mean
Your car is telling you something is wrong. A warning light on the dashboard, a sudden drop in power, or the engine going into limp mode, these are not things to ignore. On a diesel car, the most common cause of all three is a blocked diesel particulate filter.
The short version
This page is your starting point. Use it to identify what you are seeing, understand what it means, and find the right next step.
Warning signs and what they point to
Modern diesel vehicles monitor the DPF continuously. When soot levels build up beyond a threshold the car can no longer clear through normal driving, it starts sending signals. These are the most common ones:
Any one of these on its own warrants attention. Two or more together almost always point to the DPF.
DPF warning lamp
an orange filter-shaped icon, often with dots beneath it. This is the most direct signal: your DPF is partially blocked and the car has attempted, but failed, to run a regeneration cycle.
Engine management light
a broader warning that a fault code has been stored. DPF-related fault codes (P2463, P2002) are among the most frequent triggers on diesel cars.
Limp mode
the ECU has reduced engine power to protect the vehicle. A heavily blocked DPF is one of the most common causes of limp mode on modern diesels.
Loss of power
if the DPF is partially blocked, exhaust gas cannot flow freely. You may notice the car feeling flat, struggling to accelerate, or refusing to rev past a certain point.
Black smoke
particularly on acceleration. Unburnt soot that cannot be trapped by the filter exits through the exhaust instead.
What the sub-pages cover
Each symptom has its own page with more detail:
Our fix
Manchester DPF Cleaning offers a mobile chemical flush service across Greater Manchester. We come to your vehicle, at home, at work, wherever it is parked, and clean the DPF using a professional-grade chemical process. No tow truck, no garage booking, no waiting.
Fixed price: £275. Call 0161 694 7331 to book.