Fair Price Catalytic Converter?

sashcraft

Member
So I've been fighting a P0420 code for a bit and think it's time to finally just replace the rear cat. I really hate to go aftermarket and I found a used oem with 106,000 miles (CA car). Does $300 plus shipping sound like a fair price?
 
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Be very careful who you're buying that from. I'm fairly certain it's illegal to sell a used catalytic converter - I don't know if that applies to just businesses or individuals too.
 
Be very careful who you're buying that from. I'm fairly certain it's illegal to sell a used catalytic converter - I don't know if that applies to just businesses or individuals too.

Yeah, I thought so too. But I looked it up on the EPA website and it is apparently legal if the seller tests it by EPA standards. It's a reputable reseller so I think it may be ok.
 
why not just go on rockauto.com and find a good non-oem replacement one? I hear that walkers are a pretty good brand.
 
I replaced both cats with Walker for ~ $400 about 4 months ago. So far, they are doing their job. Got them both on Amazon, along with the gaskets.
 
why not just go on rockauto.com and find a good non-oem replacement one? I hear that walkers are a pretty good brand.

I've been looking at both Walkers and Catco. They seem to have the best reputation as far as aftermarket. But I read so many threads about the recurring CEL problem with aftermarket cats. And...like everyone else $1200 for new OEM is too steep... and that's just for the rear cat. I don't actually think my cat is bad...it just has some pipe perforations (rust) around the hangers. For now, I'm patching with Quicksteel but that won't last forever.
 
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No CEL problem? And did you also install an O2 simulator?

I had installed a new O2 sensor in the rear position and the code persisted. One of the cats had been replaced before, so I went ahead and just replaced both cats and have not had a CEL related to the cats since.

The CEL I have now is evap related and I'm sure it's going to drive me crazy tracking it down!
 
Go aftermarket new, don't get a used one. With a used one, you don't know the truck's history--if it had a blown head gasket, bad sensors or was running poorly for a period of time, there is a good chance the cat has lost some or all of it's effectiveness.

Walker, magnaflow, there are plenty of good brands out there that will be as good as OEM at a fraction of the cost, and certainly better than OEM with 106k miles. It's just exhaust--it's not mission critical hardware and it's certainly not proprietary or complicated. I get that OEM is best for most parts, but this is one area where it simply doesn't make a difference. A good aftermarket brand will be just as good.

Selling a used cat is illegal in CO, so check your local laws. I personally wouldn't touch it with a 10 foot pole
 
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Go aftermarket new, don't get a used one. With a used one, you don't know the truck's history--if it had a blown head gasket, bad sensors or was running poorly for a period of time, there is a good chance the cat has lost some or all of it's effectiveness.

Walker, magnaflow, there are plenty of good brands out there that will be as good as OEM at a fraction of the cost, and certainly better than OEM with 106k miles. It's just exhaust--it's not mission critical hardware and it's certainly not proprietary or complicated. I get that OEM is best for most parts, but this is one area where it simply doesn't make a difference. A good aftermarket brand will be just as good.

Selling a used cat is illegal in CO, so check your local laws. I personally wouldn't touch it with a 10 foot pole

OK, thanks for the helpful advice. You've changed my mind. I'll probably go with both cats new aftermarket. Less than half the cost of one new oem.
 
Cats

Ill be in the market for some F&R Cats too...And O2 sensors and pipe and alot of stuff.
I guess Rock auto with a Discount code is the way to go.
 
So I've been fighting a P0420 code

Have you replaced the O2 sensors yet?
I had this code and took a chance by just replacing the sensor. CEL went away immediately. If the CEL is the only indication you might want to try this first.

-Jay
 

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