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Toyota Service
Toyota Service, Toyota Expert
Category: Toyota
Satisfied Customers: 4818
Experience:  30+ Yrs of auto experience, Award Winning Svc. Manager; Just Answer Customer's Choice Award Winner
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How many catalytic converters are on a 2006 Toyota Sienna?

Customer Question

How many catalytic converters are on a 2006 Toyota Sienna ? Will vehicle breakdown if I run with bad cat converters ?
Submitted: 1 year ago.
Category: Toyota
Expert:  Toyota Service replied 1 year ago.

Hello. Welcome to Just Answer. Please allow me to assist you. There is one catalytic converter on the 2006 V6 Sienna model. If the catalytic converter is indeed bad, and neglected, over time, the catalyst material inside the metal housing will break apart. This will lead to the pieces of the catalyst material getting forced into the muffler, where it can block the muffler up. This will cause an extreme loss o power and cause the vehicle to be almost undriveable. It would be prudent to replace a documented bad converter.

Expert:  Toyota Service replied 1 year ago.

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Customer: replied 1 year ago.
I got to hear from our regular Mech, there are three cat converters so am a bit confused now. That aside, I have an upcoming long drive say about 2k, after which I plan to change the converters. In such a situation is it ok to change after the long travels.
Expert:  Toyota Service replied 1 year ago.

The picture in the service manual shows one converter. There are other things that look like converters (resonators) but only one cat. What makes your mechanic think the converter is bad? Converter failures are rather rare these days.