2005 Yukon Denali XL Exhaust Rattle Loose Catalytic Converter Element?

[05dnlxl]

I have a 2005 Yukon Denali XL 6.0 that has recently developed a rattling sound in the exhaust. Almost sounds like a loose heat shield or that rocks are inside of it hitting the metal. I'm pretty sure that the passenger side catalytic converter element has become loose and is making the noise. I'm concerned that it may eventually clog up and burn up the engine. I don't want that to happen. The vehicle frequently does a code P0171 and P0174 if it's under load, so I suspect that may have caused the catalytic converter damage. Lately I've been getting a different code/check engine light while sitting at a stop light that says one of the catalytic converters is not up to *****. This truck is rusty and not worth much, but still a good dependable driver. I don't really care about emissions although they are still required where I am. I also don't want a check engine light on all the time. I don't want to spend a fortune. What are my options? Thanks in advance.

 

[Big Mama]

If your state requires emissions testing you’ll find out then. If it doesn’t you still are taking a chance. The innards coming loose won’t help and you’ll keep getting CELs. Chances are it’s just one converter, I’m guessing upstream. Climb under and give all of them a shake. Some salvage yards have used cats priced much lower than new.

 

[Fless]

Lightly tapping the converters with a rubber mallet may give you an indication of the converter internals condition.

 

[SpareParts]

If your state requires emissions testing you’ll find out then. If it doesn’t you still are taking a chance. The innards coming loose won’t help and you’ll keep getting CELs. Chances are it’s just one converter, I’m guessing upstream. Climb under and give all of them a shake. Some salvage yards have used cats priced much lower than new.

Believe it is illegal for a wrecking yard to sell cats to anyone.
Search marketplace for someone parting one out is an option.

 

[Doubeleive]

I have a 2005 Yukon Denali XL 6.0 that has recently developed a rattling sound in the exhaust. Almost sounds like a loose heat shield or that rocks are inside of it hitting the metal. I'm pretty sure that the passenger side catalytic converter element has become loose and is making the noise. I'm concerned that it may eventually clog up and burn up the engine. I don't want that to happen. The vehicle frequently does a code P0171 and P0174 if it's under load, so I suspect that may have caused the catalytic converter damage. Lately I've been getting a different code/check engine light while sitting at a stop light that says one of the catalytic converters is not up to *****. This truck is rusty and not worth much, but still a good dependable driver. I don't really care about emissions although they are still required where I am. I also don't want a check engine light on all the time. I don't want to spend a fortune. What are my options? Thanks in advance.

if it requires a carb certified cat your looking at around $650 to have one welded in, if it just needs a federal cat it will be much less
just go by any half way decent muffler shop they do this stuff all day long.

 

[05dnlxl]

I'm not worried about the emissions. I'm more interested in bypassing it and tricking the computer so there isn't a CEL all the time as cheap as I can. What's the best way to do that?