What is the reason why the fault code for carbon deposits on BMW intake valves cannot be cleared?

[SanTeagan]

Carbon deposits on BMW intake valves require a combustion chamber carbon cleaning to clear the fault code. The following are the specific impacts of long-term neglect in cleaning intake valves and throttle bodies: 1. Carbon formation: Fuel is directly injected onto the intake valves by the fuel injectors, forming carbon deposits under high temperatures. Carbon deposits on the intake manifold and intake valves absorb fuel before it enters the combustion chamber, making the fuel mixture leaner, causing the intake valves to close improperly, leading to stalling or rough idling. 2. Disruption of air-fuel ratio: Carbon deposits in the intake system reduce airflow, disrupting the critical air-fuel ratio. 3. Idle issues: This can cause poor idle quality, reduced power, increased fuel consumption, and higher emissions.