BMW Diesel Common CEL Codes - Troubleshooting Help Resource
Code 3F25 can be a tune problem or problem caused by an issue like the code below, 3F25 is ambiguous at best, not very helpful for diagnostic purposes
Code 4D96 usually relates to problems with:
- Exhaust gas pressure sensor faulty - Sensor available here https://www.tunemyeuro.com/bmw-m57-exhaust-pressure-sensor/ (requires adaptation reset with ISTA)
- Exhaust gas pressure sensor adaptations out of range need to be reset with ISTA
- Faulty MAP sensor, replace and also requires reset of Exhaust gas pressure sensor using ISTA - MAP sensor available here https://www.tunemyeuro.com/bmw-pressure-sensor-map-sensor-13-62-7-792-260/
- Faulty hose connected to Exhaust gas pressure sensor - hose available here https://www.tunemyeuro.com/bmw-manifold-pressure-sensor-hose-13627812806/