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Toyota Tacoma Catalytic Converter Parts Questions & Experts Answers
Q: What is the importance of the catalytic converter in the exhaust system on 2005 through 2009 Toyota Tacoma?
A: Because of the Federally mandated extended warranty covering emissions-related components such as the catalytic converter, it is advisable to check with a dealer service department before replacing the converter at your own expense. The catalytic converter is an emission control device added to the exhaust system to reduce pollutants from the exhaust gas stream, with two types: the oxidation catalyst, which reduces hydrocarbon and carbon monoxide levels by adding oxygen, and the reduction catalyst, which lowers oxides of nitrogen by removing oxygen. These catalysts are combined into a three-way catalyst that addresses all three pollutants. In V6 models, there are four catalytic converters, two per cylinder bank, with upstream catalysts integrated into the exhaust manifolds and downstream catalysts located in the two-piece front exhaust pipe, which can be replaced separately. Four-cylinder models have two catalytic converters as integral components of the front exhaust pipe assembly, requiring the entire assembly to be replaced if either catalyst fails. Testing for a malfunctioning catalytic converter involves taking the vehicle to a dealer or authorized emissions inspection facility, while regular inspections for leaks, corrosion, and damage should be conducted whenever the vehicle is raised for servicing. If a converter is suspected to be plugged, a vacuum gauge can be used to diagnose the effect of a blocked exhaust on intake vacuum. For replacement, V6 models allow for the removal of upstream and downstream catalysts, with specific steps for detaching the left and right cylinder bank catalysts, while four-cylinder models require the replacement of the entire front exhaust pipe assembly if either catalyst fails. Installation follows the reverse of removal, ensuring new gaskets and fasteners are used and all flange nuts are securely tightened.