marieschubert25
Seat Formentor diesel power loss and smoke
Summary of the thread
A 2021 Seat Formentor diesel is experiencing power loss and smoke during acceleration, raising concerns about passing vehicle inspection and affecting fuel efficiency. The issue is suspected to be a defective diesel particulate filter, which can cause these symptoms. It is suggested to check for backpressure and ensure proper regeneration frequency, as a clogged filter often leads to these problems. Ultimately, replacing the diesel particulate filter resolves the issue, restoring the car's performance.
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4 comment(s)
marieschubert25 (community.author)
Backpressure? How would I even check that? And how often should the regeneration be happening?
matteofischer5
Checking backpressure requires diagnostic tools, so probably best left to a workshop. As for regeneration frequency, it depends on driving conditions. But excessive regeneration along with those symptoms points to a blocked diesel filter. Before replacing it, confirm it's not a sensor issue causing incorrect readings. But yeah, sounds like a defective diesel filter. A new diesel filter is probably needed.
marieschubert25 (community.author)
Thanks for the insight! Took it to the shop and you were spot on – diesel particulate filter was indeed the culprit. Cost me 1550€ to replace. At least the car runs like new again.
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SEAT
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FORMENTOR
matteofischer5
Reduced power and smoke? Sounds familiar. I had a similar issue with my Seat Ateca (diesel too). Have you checked the backpressure? A clogged diesel filter often causes that. Is the regeneration happening frequently?