patrick_dunkel1
XC40 Diesel Particulate Filter Pressure Too Low
Summary of the thread
A 2018 Volvo XC40 diesel owner experienced a warning light, reduced engine power, noticeable smoke, and a strong exhaust smell. The diagnostic tool indicated "Diesel particulate filter exhaust pressure too low," suggesting a potential issue with the exhaust back pressure sensor. Another individual with a similar issue confirmed that a faulty sensor was the cause and recommended a workshop diagnosis. The problem was resolved by replacing the defective sensor, restoring the vehicle's performance.
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4 comment(s)
patrick_dunkel1 (community.author)
Yeah, it is struggling to rev, definitely feels like something is holding it back. When you say similar, do you mean the low-pressure reading was also pointing to a faulty sensor for you? What was the fix?
pia_kaiser8
Exactly that! The low pressure reading was spot on, and yep, turned out to be the exhaust back pressure sensor. I'd suggest getting it checked at a workshop – they can confirm it with proper diagnostics. It's worth getting it sorted quickly, since DPF issues can cause more expensive problems down the line.
patrick_dunkel1 (community.author)
Thanks for confirming, really appreciate it! Booked it into the workshop, and you were spot on. The exhaust back pressure sensor was indeed defective. Replaced it, cost me about 245€ all in. Running smooth again now!
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VOLVO
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XC40
pia_kaiser8
I had something similar with my XC40 diesel. Is it struggling to rev? That's the main symptom I had. Low pressure readings can indicate a faulty sensor. A pressure sensor, in its simplest form, is just a device that translates pressure into an electrical signal that the engine control unit (ECU) can understand.