: A poorly installed, loose, or incorrect air filter can cause this fault. Specifically, on N57 engines, certain thick grey fleece filters have been known to cause "air mass too high" readings and should be replaced with thinner white fleece versions. Intake System Leaks
Other sensors, such as the boost pressure sensor or charge-air temperature sensor, may provide incorrect data if they are sooted or failing. Service & Troubleshooting Plan bmw 2ddd00
Understanding and Fixing BMW Fault Code 2DDD00: EGR and Air Mass Issues : A poorly installed, loose, or incorrect air
The most common cause of the fault code in BMW and MINI diesel engines is carbon buildup. Diesel engines recirculate a small amount of their exhaust gases back into the engine's combustion chambers to reduce nitrogen oxide (NOx) emissions. Over time, this hot, sooty exhaust gas hardens into a thick, crusty deposit of carbon, sticking to various components. The main culprits are: Service & Troubleshooting Plan Understanding and Fixing BMW