Create access to the intake system. This should be positioned downstream of the air flow meter/turbocharger/charge air cooler, where possible directly in front of the intake manifold. Start the engine to begin cleaning.

If the engine cannot maintain the speed with the intake pipe removed or cannot be started, disconnect the plug from the air flow meter with the ignition switched off. In this case, the stored fault must be deleted from the engine control unit after cleaning using a suitable diagnostic device and the air flow meter must be taught in again if necessary.