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The BMW error code 3F35 points to a problem with the charge pipe connecting the intercooler and the throttle valve. This part is sometimes known as the boost air hose. When this code appears, it is often associated with a decrease in power and rough idling, indicating a need to replace the charge pressure sensor. Certain BMW models, particularly the E70 and E90 with M57Y diesel engines, may also face an issue with oil leaks in the Turbocharger Air Hose. A TSB has been issued for this problem, caused by potential damage from road debris to the plastic seal in the charge air pipe. The solution involves replacing the seal to prevent both air and oil leaks in the turbocharger system for affected vehicles.
In a BMW, if you come across code 3F35, it is an indication of an issue with the vehicle's turbocharging system.