Catalyst system efficiency below threshold (Bank 1)
The function of the catalytic converter is to break down harmful pollutants created by the vehicle during the combustion cycle. The exhaust is converted into less harmful gases. Error code P0420 indicates that the catalytic converter is not functioning properly, therefore increasing the output of harmful pollutants by the vehicle.
Check Engine Light turned ON Lack of power Poor fuel average Sulfur smell
While P0420 does not pose a danger to the driver, it causes driveability concerns such as a lack of power or poor acceleration. It can also cause severe damage to other components of your vehicle if not addressed on time. It is recommended that you fix P0420 as soon as possible to keep the cost of the repair to a minimum.
Sometimes, the P0420 code can be a bit tricky to diagnose. Some people think that they have fixed the fault and then 100 km later, the light pops up again.
Let us know if that is the case and we will rectify it for you at a minimal cost. For diesel vehicles please go through the article.