Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Catalytic Converter



The catalytic converter is a muffler-like container built into the exhaust system to aid in the reduction of exhaust emissions. When the exhaust gases come into contact with the catalyst, a chemical reaction occurs which reduces the pollutants into harmless substances such as water and carbon dioxide.

On the Toyota trucks covered by this information, a 3-way catalytic converter is used.


Use only unleaded fuel.
Avoid prolonged idling; the engine should run no longer than 20 min. at curb idle and no longer than 10 min. at fast idle.
Don't disconnect any of the spark plug leads while the engine is running. If any engine testing procedure requires disconnecting or bypassing a control component, perform the procedure as quickly as possible. A misfiring engine can overheat the catalyst and damage the oxygen sensor.
Whenever under the vehicle or around the catalytic converter, remember that it has a very high outside or skin temperature. During operation, the catalyst reaches high temperatures to work efficiently. Be very wary of burns, even after the engine has been shut off for a while. Additionally, because of the heat, never park the vehicle on or over flammable materials, particularly dry grass or leaves. Inspect the heat shields frequently and correct any bends or damage.