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What is a heated Catalyst?

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Old 09-26-2007, 02:06 AM
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What is a heated Catalyst?

.............I have been playing with an engine diagnostic software and I need some help. The software has a separate category for Catalyst and another category for heated catalyst. What is the difference?

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Last edited by Ted Baldwin; 09-26-2007 at 02:14 AM.
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Old 09-26-2007, 02:46 AM
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a heated catalyst is just one that has an electronically controlled heating element that is used to quickly heat the catalyst during cold starts.
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Old 09-26-2007, 02:56 AM
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Originally Posted by chiromikey View Post
a heated catalyst is just one that has an electronically controlled heating element that is used to quickly heat the catalyst during cold starts.
.............Thanks. I have a check engine light. Diagnostic software says "heated catalyst" is bad, but there is a separate line for "catalyst" which it says is fine. Trying to figure out if the heated calyst is a separate unit or if it is part of the catalytic converter.........for which replacing the catalytic converter itself will resolve the problem

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Old 09-26-2007, 08:12 AM
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Just a guess - but there two sets of cats on the 55 - primary and secondary, right? I think one is heated and one isn't. Which is which, I can't tell you. I would guess the ones closest to the motor are heated.
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Old 10-04-2007, 07:39 PM
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Originally Posted by enzom View Post
Just a guess - but there two sets of cats on the 55 - primary and secondary, right? I think one is heated and one isn't. Which is which, I can't tell you. I would guess the ones closest to the motor are heated.
..........Thanks


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Old 10-04-2007, 09:07 PM
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Originally Posted by Ted Baldwin View Post
..........Thanks


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The cat converters are not electronically heated, only the o2 sensors are.
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Old 10-05-2007, 07:10 AM
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Originally Posted by [email protected] View Post
The cat converters are not electronically heated, only the o2 sensors are.

............Getting confused, but thanks. I need the right answer. Look at this list of codes. What needs to be replaced when you have code p0433?

http://www.autoshoppingcenter.com/OB...ublecodes.html

Thanks.

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Old 10-05-2007, 11:52 AM
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Originally Posted by Ted Baldwin View Post
............Getting confused, but thanks. I need the right answer. Look at this list of codes. What needs to be replaced when you have code p0433?

http://www.autoshoppingcenter.com/OB...ublecodes.html

Thanks.

Ted
Ted, I couldn't find p0433 in my Audi docs, but could find p0432. I'll keep looking. You may also find info on a GM V8 forum, I believe they can have this SAE/Bosch code come up as well. My suspician is that a catalytic convertor on the passenger side is done for.

Last edited by mclarenm8d; 10-05-2007 at 11:56 AM.
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Old 10-08-2007, 08:01 PM
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Originally Posted by Ted Baldwin View Post
............Getting confused, but thanks. I need the right answer. Look at this list of codes. What needs to be replaced when you have code p0433?

http://www.autoshoppingcenter.com/OB...ublecodes.html

Thanks.

Ted
Sounds like the rt side cats are ineffective too me- warranty on those are 8 years 80k miles.
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