A chemical process in the catalyst decomposes harmful components from the exhaust gases and converts them into harmless substances. With a defective catalytic converter, a car cannot pass the MOT, driving with one is a punishable offence. Clogged catalysts can in many cases still be saved and can be cleaned with fuel additives. JLM offers an extensive range of fuel additives which clean the entire fuel system including the catalyst and prevents future pollution. These JLM products wors quickly and effectively, making it easier for a car to pass the inspection