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The Liqui-Moly Air Flow Sensor Cleaner is a special active solvent for fast and gentle cleaning of sensitive components of the air flow sensor in both petrol and diesel engines. It distinguishes itself by means of a very fast evaporation that is free of residues. It is important to clean the components of the air flow sensor as dirty components can give incorrect readings for calculating the fuel/air mixture, this can be effected by a dirty hot wire or hot plate in the air flow sensor. This can impair the starting and idling properties of the vehicle, which in turn can effect the engine performance and fuel consumption.