The 2003-2011 Toyota 4Runner 4.0L requires a Left Rear and Right Rear Catalytic Converter, OE part number 17450-31111. These catalytic converters are essential components of the vehicle’s emissions system, and are designed to reduce harmful pollutants in the exhaust gases.
The Left Rear and Right Rear Catalytic Converters are located towards the back of the vehicle, and are responsible for converting the exhaust gases from the engine into less harmful emissions before they exit the tailpipe. This is achieved through a complex process of chemical reactions, which involve the use of precious metals such as platinum, palladium, and rhodium.