Tech Tip: Catalytic Converters

A catalytic converter is the device used to lessen the amount of CO, NOx and HC present in tailpipe emissions. It is monitored by the onboard computer for engine efficiency and pollution control. The modern catalytic converter performs two functions. It oxidizes (burns) the CO and unburned HC present in the exhaust stream and it reduces the amount of NOx released into the air. What makes a catalytic converter fail?