This Fault Code usually come in Car when catalytic is not working properly.The reason is bad quality of Fuel available in Pakistani Pumps. The catalytic converter is a critical component of your vehicle’s exhaust system. It is designed to break down harmful pollutants such as carbon monoxide and hydrocarbons that are byproducts of internal combustion. Inside the cat are catalysts (such as platinum, palladium, and rhodium) that convert these toxic emissions into a benign state