Fault Code P0420 “Catalyst System Efficiency Below Threshold .”

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 that is less harmful to the environment.



Each converter has an oxygen sensor in the front and another on its rear. While the vehicle is running in closed loop mode, the readings of the upstream O2 sensor should ideally fluctuate, while the readings of the downstream O2 sensor should be steady.

Bring your car at AlRafay Auto Repair to get it clean and fix.

P0420 typically means that a converter has worn out or degraded—not obstructed or clogged. But if the case is the latter, it can lead to engine performance problems, such as a lack of power, rough idling, and stalling, which are some of the common signs of a clogged catalytic converter

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