Most fuel injected vehicles are fitted with a mass air flow (MAF) sensor to measure air entering the engine which the ECU uses to determine the proper air/fuel mixture. However, the MAF sensor gets dirty with debris, oil, grease and air filter fibres, causing inaccurate measurements of air flow which results in a rich running engine, loss of power and excess emissions. CRC MAF Sensor Cleaner will safely clean and protect your mass air flow sensor, improving air/fuel ratio and increasing kilometres per litre. The use of aggressive products like brake and carburettor cleaners on MAF sensors can cause serious damage to sensitive parts. Note: Not all vehicles have a MAF sensor