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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Cat failure...



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      10-29-2012, 06:47 AM   #1
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Cat failure...

So as i was driving yesterday and all of a sudden my car lost most of its power and the idle was very rough and there was a constant popping noise coming from the exhaust. I checked the code and my cat malfunctioned. Im thinking now i might need new secondary cats. Would it be better for me to buy oem cats or replace them with vibrant resonators or something else? What do you guys think? Opinions?
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      10-29-2012, 06:55 AM   #2
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read the codes. the 02 probes sit in the dps not midcats.
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      10-29-2012, 07:09 AM   #3
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if they went bad, and you're out of warranty. i would go catless and put in some resonators to clean up the sound.
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      10-29-2012, 01:01 PM   #4
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cats have a 8 year 80,000 mile warranty
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      10-29-2012, 01:20 PM   #5
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Will there be a fault at all if the secondary cats are defective?

IMHO:
Lambda sensor controls the AFR (upstream the catted DPs)
Monitor sensor checks if the precat are defective (downstream the catted DPs)

But there is no sensor located downstream the secondary cats. Or maybe I'm simply wrong.
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      10-29-2012, 01:27 PM   #6
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Quote:
Originally Posted by Schnitzel View Post
Will there be a fault at all if the secondary cats are defective?

IMHO:
Lambda sensor controls the AFR (upstream the catted DPs)
Monitor sensor checks if the precat are defective (downstream the catted DPs)

But there is no sensor located downstream the secondary cats. Or maybe I'm simply wrong.
no error whatsoever
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      10-30-2012, 11:13 AM   #7
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Thanks guys hopefully i can get it checked out and fixed soon
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      10-30-2012, 01:45 PM   #8
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Quote:
Originally Posted by Bimmer.335i. View Post
I checked the code and my cat malfunctioned.
what code was it?
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      10-31-2012, 09:01 AM   #9
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Quote:
Originally Posted by CHECKERED View Post
what code was it?
cant remember off the top of my head ill check again and let you know
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