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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 03-16-2015, 03:41 PM
Mfan225 Mfan225 is online now
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Catalytic Converter

I was told by my Indy that I need a new catalytic converter (rear/bank 2).

Would you guys recommend going OEM, or aftermarket? Should I replace the one that's giving me trouble (bank 2) or both?

It's a 525i with 111k... so the cats are built into the exhaust manifold.

I am going to try CatClean and see if that does anything.
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  #2  
Old 03-16-2015, 03:53 PM
Zerodynamic Zerodynamic is offline
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I've heard of folks going aftermarket (magnaflow) with great results.

OEM would be ideal, just not sure if you want to spend that kind of cash.
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  #3  
Old 03-16-2015, 03:54 PM
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bluebee bluebee is offline
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I don't know the answer, but you might find some information in these threads, especially if you have the P0420 code:
- How to remove & replace a catalytic converter (1) & how to fix rattling cat shields (1) & BMW P0420 codes related to cats (1) (2) (3) & cat autopsy photos (1) & what kills cats (1) & an EPA fact sheet on catalytic converter warranties (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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Old 03-16-2015, 04:41 PM
edjack edjack is offline
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How did the Indy determine that? Unusual for later-model E39s to need new cats.
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  #5  
Old 03-16-2015, 04:43 PM
Mfan225 Mfan225 is online now
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Quote:
Originally Posted by edjack View Post
How did the Indy determine that? Unusual for later-model E39s to need new cats.

Post cat O2 sensor on bank 2 running rich. I did all four o2s last year and had a misfire issue that I let drag out for about 6 months.... I bet that's what burnt it up.
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Old 03-16-2015, 04:44 PM
Mfan225 Mfan225 is online now
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Quote:
Originally Posted by Zerodynamic View Post
I've heard of folks going aftermarket (magnaflow) with great results.



OEM would be ideal, just not sure if you want to spend that kind of cash.

I found an OEM reMan for $900. Would you recommend replacing one or both?
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Old 03-16-2015, 04:53 PM
edjack edjack is offline
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The Indy s/b able to determine if the cats are plugged. If the misfires were across all cylinders, it's likely that both cats are bad.
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  #8  
Old 03-16-2015, 06:12 PM
Mfan225 Mfan225 is online now
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Originally Posted by edjack View Post
The Indy s/b able to determine if the cats are plugged. If the misfires were across all cylinders, it's likely that both cats are bad.

He said just the one was bad but that i may as well replace both while I'm in there. thinking of DIYing it... I have a friend with a lift.
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  #9  
Old 03-16-2015, 06:14 PM
Edge540 Edge540 is offline
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ck out rockauto.com they have several to choose from I prefer Eastern cats. I wouldn't replace the other unless you have to
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  #10  
Old 03-16-2015, 06:16 PM
Mfan225 Mfan225 is online now
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Originally Posted by Edge540 View Post
ck out rockauto.com they have several to choose from I prefer Eastern cats. I wouldn't replace the other unless you have to

Have you used them? I'd rather just get OEM or something known to work so I only have to do this once.
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  #11  
Old 03-16-2015, 06:43 PM
Edge540 Edge540 is offline
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yes I have used several, the Eastern sells for 385.00 what does OEM sell for? me and my brothers have a custom exhaust shop and cat work is the biggest part of our business .
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  #12  
Old 03-16-2015, 07:10 PM
nthach530 nthach530 is offline
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Quote:
Originally Posted by Mfan225 View Post
I was told by my Indy that I need a new catalytic converter (rear/bank 2).

Would you guys recommend going OEM, or aftermarket? Should I replace the one that's giving me trouble (bank 2) or both?

It's a 525i with 111k... so the cats are built into the exhaust manifold.

I am going to try CatClean and see if that does anything.
I have the codes for both cat p0420 and p0430, i would erase the codes and it would always comes back about 60-80 miles of driving later, not wanting to spend $500+ on aftermarket cats I add one bottle of cataclean to see what it does at $25 a bottle it ain't cheap but if it works then it's sure better then spending $500+ lol so i added a bottle drove for about 30 miles and notice that it ran a lot better, smoother with quicker throttle respond, couple days later 60-80 miles comes around light came on agian, same codes, i erased them and decide to add another bottle thinking maybe my cats are really clogged and it needed another bottle, so I added another bottle erase the codes I'm now at around 200 miles since then and the codes has not return..crossing my fingers and hoping it won't ever...it may or may not work for you but I think it's worth a try...

Last edited by nthach530; 03-16-2015 at 07:15 PM. Reason: spelling
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  #13  
Old 03-16-2015, 07:13 PM
Mfan225 Mfan225 is online now
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Quote:
Originally Posted by nthach530 View Post
I think it's worth a try...

Yeah I am definitely going to try a bottle or two and see what happens. Hoping that it works, but if not I have a friend with a lift that I can get to help me install a new one instead of having to pay a shop for 6 hours of labor on top of the insane prices for cats for our cars.
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  #14  
Old 03-16-2015, 07:25 PM
nthach530 nthach530 is offline
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Quote:
Originally Posted by Mfan225 View Post
Yeah I am definitely going to try a bottle or two and see what happens. Hoping that it works, but if not I have a friend with a lift that I can get to help me install a new one instead of having to pay a shop for 6 hours of labor on top of the insane prices for cats for our cars.
Just follow the directions on the bottle, add when it's almost empty at 1/4 tank it say to drive normal for 13 miles but I drove the **** out my car passing 5k here and there and i held it there, reving up and down
..hoping the chemical would clean and by my hard driving it would push whatever is built up in the cat out..
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