How many catalytic converters does the 2011 Buick LaCrosse have?

The 2011 Buick LaCrosse has dual-system catalytic converters, designed for redundancy. The exhauSTSystem has a catalytic converter. A converter can often last for 10 years or more, but it can become contaminated, clogged, overheated, or physically damaged leading to sluggish engine performance, cause a check engine light, and, eventually, an engine shutdown.Catalytic converters can overheat because of excessive amounts of unburned gas caused by a mIS Firing spark plug or a leaky exhaust valve. Besides, a failed oxygen sensor can cause overheating. On many vehicles, the cat is located under the vehicle, and like other parts of the exhauSTSystem, it can also be damaged by road debris or by running over a curb.