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antonbaumann33

Citroen C4 diesel particulate filter pressure too low

I'm experiencing a concerning issue with my 2023 Citroen C4 diesel. The engine is showing a warning light, accompanied by reduced power and noticeable smoke when accelerating, plus a strong exhaust smell. The car has 43746 km. I've read the error code, which indicates the diesel particulate filter exhaust pressure is too low. I suspect a defective exhaust back pressure sensor. Has anyone encountered something similar?

4 comment(s)

hermannkoehler24

Hey, I had a similar issue with my Citroen C4, though it was a petrol engine. Low pressure and reduced power sounds familiar. Has the issue appeared suddenly, or has it gradually worsened?

antonbaumann33 (Author)

Thanks for your input. The issue appeared quite suddenly. One day the car was running fine, the next day the warning light was on and the power was noticeably reduced. Is this similar to what you experienced?

hermannkoehler24

Yes, the sudden onset is exactly what I remember. Given that, and the error code you mentioned, it really does sound like the pressure sensor. If I were you, I would take it to a workshop to have it properly diagnosed and repaired.

antonbaumann33 (Author)

Thanks for the advice. I took it to the workshop as you suggested. It was indeed the exhaust back pressure sensor. The repair cost me 245€. All the symptoms disappeared after the sensor replacement.

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