3E90 — BMW DPF Exhaust Pressure Sensor Malfunction
| Meaning | The engine control unit has detected an implausible signal from the diesel particulate filter exhaust pressure sensor. On this BMW model, this sensor monitors the soot accumulation by measuring backpressure before the filter, and a fault means the system cannot accurately judge the filter's condition. |
| Family | Manufacturer-native code |
Typical symptoms
Possible reduced engine power or limp mode
Increased frequency of attempted regeneration cycles
Common causes
Faulty exhaust pressure sensor itself
Wiring harness or connector damage due to high heat near the exhaust
What to do
Frequently asked questions
What does code 3E90 mean?
BMW DPF Exhaust Pressure Sensor Malfunction. The engine control unit has detected an implausible signal from the diesel particulate filter exhaust pressure sensor. On this BMW model, this sensor monitors the soot accumulation by measuring backpressure before the filter, and a fault means the system cannot accurately judge the filter's condition.
Can I keep driving with code 3E90 active?
With caution: limp mode possible, have it checked soon
Common causes — 3E90
Clogged or melted pressure sensing pipe leading to the sensor Faulty exhaust pressure sensor itself Wiring harness or connector damage due to high heat near the exhaust
How do you fix code 3E90?
Have a technician inspect the small metal or rubber pressure pipes connected to the exhaust for soot blockages before replacing any electrical parts. Address this promptly, as ignoring it can prevent the diesel particulate filter from cleaning itself, leading to severe clogging.
We are ECU specialists: diagnosis, file repair and remapping for cars, bikes, trucks and agricultural vehicles.
Contact usRelated codes
- 3E90 — Crankshaft RPM No Signal
- 3E91 — Crankshaft RPM - Wrong Signal
- 3E91 — Crankshaft RPM Wrong Signal
- 3E95 — Intake air Temperature Sensor
- 3E95 — Intake air Temperature Sensor
- 3EA0 — Crankshaft Position Sensor
- 3EA0 — Crankshaft Position Sensor
- 3EA1 — Crankshaft Position Sensor
- 3EA1 — Crankshaft Position Sensor
- 3EA5 — Intake air Temperature Sensor
- 3EA5 — Intake air Temperature Sensor
- 3EA6 — Intake air Temperature Sensor