Engine
DPF Problems — Causes, Cleaning, and Prevention
A blocked Diesel Particulate Filter causes power loss, poor economy, and dashboard warnings. Regular regeneration and proper driving habits help prevent blockages.
The DPF traps soot from diesel exhaust to reduce emissions. Over time, it fills up and needs to regenerate by burning off the trapped soot at high temperature. Short journeys, stop-start driving, and low-speed urban use prevent natural regeneration, leading to blockages. Symptoms include the DPF warning light, reduced engine performance, increased fuel consumption, and the engine entering limp mode. Forced regeneration by a garage can clear mild blockages, but heavily clogged filters need professional cleaning or replacement.
Key takeaways
- Frequent short journeys prevent the DPF from regenerating naturally
- The DPF warning light means regeneration is needed or the filter is blocked
- Professional forced regeneration can clear mild blockages without replacing the DPF
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