In this video, we show how to properly diagnose and fix the common 28DE00 exhaust back pressure sensor fault on a 2016 MINI Cooper SD fitted with the B47 diesel engine. This issue also affects other BMW and MINI models using B37/B47 engines.
BMW/MINI Dealer Approach
According to official BMW guidance, the recommended fix involves replacing all of the following:
- Exhaust manifold
- Stainless banjo bolt
- Exhaust pressure pipe
- Exhaust back pressure sensor
Total cost: often around £2,000 in parts and labour.
What’s the Real Problem?
In most cases, the real issue is a soot-blocked exhaust pressure pipe. There’s usually nothing wrong with the sensor itself.
What This Video Covers
- Reading fault code 28DE00
- How to safely remove the exhaust pressure pipe
- Cleaning method using wire and solvent
- Live sensor readings before and after cleaning
Tools and Products Used
- Flexible steel wire
- Petrol or brake cleaner
- Socket and spanner set
Common Symptoms
- Loss of engine power
- DPF not regenerating properly
- Fault code 28DE00 stored
- Implausible pressure readings on diagnostics
FAQs
Is it safe to clean the pipe yourself?
Yes, as long as you remove the pipe carefully and ensure it’s fully clear and reinstalled correctly.
Do I need to replace the sensor?
Usually not. The sensor often works perfectly once soot is cleared from the pipe feeding it.
Will this stop my DPF from clogging?
If caught early, yes. Cleaning the pipe restores correct pressure readings needed for regen cycles.
Is this a permanent fix?
It can be, but the pipe may clog again over time. We recommend checking it during regular servicing.