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Old 02-13-2020, 01:06 PM   #1
Hot_tub
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Can a P0430 Be caused by a gasket exhaust leak?

More specifically from the title;

I have a fairly noticeable exhaust leak at the gasket where the 4 bolts connect the bottom of the header cats to the lower pipes. When its cold I can see smoke/condensation puffing out and I can certainly feel the air forcing out when I put my hand under the leak spot. Could this be a possible cause for the code?

Yes, I'll get this fixed, i'm asking purely from a 'engineering problem solving' standpoint.
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Old 02-13-2020, 01:10 PM   #2
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Sure-

the o2 sensors are right in front of this gasket, and reversion in the
individual pipes would be enough to draw in some oxygen.


t
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Old 02-13-2020, 02:06 PM   #3
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Thoughts on replacing the bolts with these ebay bolts? It's better than spending $21 per bolt!
https://www.ebay.com/i/184131955529?...SABEgKJGvD_BwE

Heres the OEM catalog for comparison;
https://www.realoem.com/bmw/enUS/sho...diagId=11_2183
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Old 02-13-2020, 02:21 PM   #4
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Originally Posted by Hot_tub View Post
Thoughts on replacing the bolts with these ebay bolts? It's better than spending $21 per bolt!
https://www.ebay.com/i/184131955529?...SABEgKJGvD_BwE

Heres the OEM catalog for comparison;
https://www.realoem.com/bmw/enUS/sho...diagId=11_2183
I don't even know how those bolts would be considered replacement items. I tried like hell to drive my cruddy ones out and finally gave up and drilled them, and even then they're harder than hell and I ate through three drill bits!

I replaced them with M10s from the hardware store and they're fine. The car is here in the South now and got away from its one winter in New Hampshire, so hopefully corrosion is a thing of the past.
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Old 02-13-2020, 02:28 PM   #5
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those bolts
Are you referring to the bolts i linked in the ebay being not a good replacement? They seem to match the size and all that oem is suggesting?
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Old 02-13-2020, 03:33 PM   #6
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Are you referring to the bolts i linked in the ebay being not a good replacement?
Nah, I think he's referring to the expensive OE bolts.

Exhaust leak can definitely cause that OBD code.
P0430: Catalyst System Efficiency Below Threshold (Bank 2)
https://www.obd-codes.com/p0430

I just noticed OP's username matches TobyB's tagline. Coincidence???
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Old 02-13-2020, 05:13 PM   #7
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Good to hear! I'll get that all patched up and see if it comes back (i cleared it with OBD Fusion)

And NOT a coincidence, that did happen to me
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