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christopherknight1

Seat Leon Diesel DPF Issue

I'm having some trouble with my 2009 Seat Leon diesel, it has almost 200000 km on the clock. A warning light has appeared, and the engine power is noticeably reduced. Also, there's smoke when accelerating and a strong exhaust smell. I think it might be the diesel particulate filter, maybe the exhaust pressure is too low. I've read that a defective exhaust back pressure sensor could cause this. Has anyone else had similar DPF issues?

Summary of the thread

A 2009 Seat Leon diesel with nearly 200,000 km exhibited a warning light, reduced engine power, smoke during acceleration, and a strong exhaust smell, suggesting a diesel particulate filter (DPF) issue. The problem was suspected to be related to low exhaust pressure, potentially caused by a defective exhaust back pressure sensor. After replacing the sensor, the vehicle's performance improved, resolving the warning light, power loss, smoke, and exhaust smell.

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4 comment(s)

leonie_schaefer9

Sounds like DPF issues. I had similar reduced power and exhaust smell with my old Vauxhall Astra diesel. Is it trying to do a DPF regeneration often?

christopherknight1 (community.author)

That's interesting. How did you know it was related to DPF regeneration? The engine fan is running more often, but I wasn't sure if that was connected. Did you also experience the smoke when accelerating?

leonie_schaefer9

The frequent regeneration attempts, yes. The fan running longer is a sign. I'm not sure about the smoke, but the reduced power points to the DPF being clogged or the sensor failing. Getting it checked by a workshop might be a good idea.

christopherknight1 (community.author)

It was the exhaust back pressure sensor, like I thought. Replaced it, and the Leon is running great again. The light is gone, power is back, and no more smoke or exhaust smell. Total cost was 245€, including everything. Thanks for sharing your experience; it helped me figure things out.

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SEAT

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LEON