Fluence diesel low exhaust pressure

Sounds like DPF issues, alright. Low exhaust pressure can be a tricky one. When was the last time the DPF regeneration cycle completed successfully? If it's been a while, the filter might be clogged, causing the low pressure reading. The ECU usually triggers regeneration when it detects a certain level of soot accumulation. Also, have you checked for any exhaust leaks before the DPF? Even a small leak could throw off the pressure readings.

Thank you for your insights. The regeneration cycle should occur automatically, correct? I haven't manually initiated one. As for exhaust leaks, where specifically should I be looking before the DPF? I am not sure where the DPF is located.

Correct, regeneration is normally automatic, but sometimes it fails due to various reasons, such as frequent short trips where the engine doesn't reach the required temperature. As for the DPF location, it's usually positioned somewhere along the exhaust pipe, downstream from the catalytic converter. Trace the exhaust pipe from the engine, and you should find a cylindrical component – that's likely it. However, considering the symptoms and the error code, along with your unfamiliarity with the DPF location, it's probably best to take it to a workshop for a proper diagnosis. A faulty exhaust back pressure sensor is a common issue and can be easily checked and replaced. It's a relatively inexpensive repair.

Thank you for confirming my suspicions and advising me to consult a professional. I took it to the workshop, and indeed, the exhaust back pressure sensor was defective. After replacing it, the warning light is gone, the engine power is back, and the smoke is no more. The repair cost me 245€.