2008 535i CATALYTIC CONVERTER HELP - Bimmerfest - BMW Forums



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E60 / E61 (2004 - 2010)
BMW 5-Series E60 Sedan was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E61 wagon followed shortly there after. The E60/E61 5 series is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 03-02-2017, 03:46 PM
1ofakind 1ofakind is offline
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2008 535i CATALYTIC CONVERTER HELP

Hey Guys

so I am having troubles with my cats, I believe they definitely need replacement, I am at about 120k miles.

Please keep in mind I know nothing about the cats on these

so the problem I am having is, these are the parts numbers
18307565330
18307565331

Those are for the replacement cats.

the part number that my mechanic took a photo of is 7565334. So I am aware that this is the part number for the "exhaust manifold headers" with O2 sensors

Are these the same parts? As in if i buy refurbished exhaust manifold headers does that come with the cats as well?

Sorry, not trying to sound dumb... but everything I Google in terms of cats for my car come up 7565330/7565331 and if buy that part, am I technically buying an entire "exhaust manifold header?"

Some help would be needed.

Thanks guys!
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Old 03-23-2017, 07:29 PM
1ofakind 1ofakind is offline
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Old 03-23-2017, 07:43 PM
impac4000 impac4000 is offline
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Did you read for codes? Is so what comes up? I've never heard anyone having problems with cats on N54 engine unless they r clogged, what are the symptoms?
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Old 03-24-2017, 07:17 AM
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Quote:
Originally Posted by impac4000 View Post
Did you read for codes? Is so what comes up? I've never heard anyone having problems with cats on N54 engine unless they r clogged, what are the symptoms?
Right... IF the cats need replaced (I am doubtful), something else needs fixed
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Old 05-10-2018, 12:40 PM
evenfall evenfall is offline
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I know this thread is a year old but I was wondering if there has been a solution.
I've had the check engine light for both cats being bad for 3 years already. No symptoms so far besides the CEL but I am totally not sure what to do when it comes to the point where they need to be replaced. I believe they are integrated into the intake manifold so the OEM solution would be prohibitively expensive. Has anyone had any luck with aftermarket parts? I have researched extensively and was not able to find much. Would appreciate any ideas.
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Old 05-10-2018, 12:43 PM
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NoQuarter NoQuarter is offline
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Quote:
Originally Posted by evenfall View Post
I know this thread is a year old but I was wondering if there has been a solution.
I've had the check engine light for both cats being bad for 3 years already. No symptoms so far besides the CEL but I am totally not sure what to do when it comes to the point where they need to be replaced. I believe they are integrated into the intake manifold so the OEM solution would be prohibitively expensive. Has anyone had any luck with aftermarket parts? I have researched extensively and was not able to find much. Would appreciate any ideas.
Well... the intake manifold is where the air comes into the engine, so no cats connected there.

What model car do you have?
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Old 05-10-2018, 12:56 PM
evenfall evenfall is offline
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Sorry, I think I meant *exhaust* manifold. I have a 2006 530i.
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Old 05-10-2018, 01:03 PM
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How did you read the codes and have you ever cleared them to see when they come back?
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Old 05-10-2018, 01:16 PM
evenfall evenfall is offline
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I had them read at both Autozone and an independent BMW mechanic and they both agreed on both cats being bad. I've had them cleared and a couple of times they went out by themselves but they always come back.
The indie actually told me he's seen the CEL with these codes to go on for many years without producing any other symptoms and recommended to do nothing until the cats actually start causing trouble. I just want to have some kind of a plan when that does happen.
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Old 05-10-2018, 01:23 PM
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If you don't require emission testing then have them cut out and replaced with pipe?

You still have 2 more cats in the exhaust.


I would have the O2 sensors replaced first.
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Old 05-10-2018, 01:26 PM
evenfall evenfall is offline
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OK thank you, I will keep that in mind. I actually talked to a few exhaust/muffler shops about this issue but neither of them would touch this particular model.
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