A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Anyone ever got this code?

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Old

Jul 21, 2004 | 07:56 AM

#1

NOLAN5162

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Anyone ever got this code?

main catalyst bank one: efficiency below threshold.

I forgot my notes that had the numbers written down on it.

i think it was 16804.

Is it the o2 sensor? Which one?
Should i replace it?

i checked block 032, and did the VAG-scope, i am really new to this. i just check at an idle, and revved it up. do i need to run the vag while i am driving to do it properly?

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Old

Jul 21, 2004 | 08:24 AM

#2

JAFO

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did you melt the wires on one of your sensors?...

some one posted this a few days ago. iirc this code is caused by bad cat or O2 sensor after cat.

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Old

Jul 21, 2004 | 08:24 AM

#3

RKA

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Its usually a sign that one of the cats is on the way out...

which means the other one isn't far behind.

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Old

Jul 21, 2004 | 08:52 AM

#4

NOLAN5162

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yeah, that was me. There are two cats? how can i figure out which it is?

Buy a new o2 sensor (after-cat), and see if that clears up the problem? or a cat? or can i check it in VAG-COM?

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Old

Jul 21, 2004 | 08:56 AM

#5

RKA

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Bank one refers to the side you're having an issue with.

Search to find out whether bank 1 is driver's or passenger's side.

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Old

Jul 21, 2004 | 09:10 AM

#6

Kris Hansen

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Passenger side. or on a 1.8t, the only side.

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Old

Jul 21, 2004 | 09:11 AM

#7

WJM

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clear it and see if it comes back first

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Old

Jul 21, 2004 | 10:20 AM

#8

Devious27t

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yeah i keep getting it with my new HFC and i just passed smog with it grr

cat is going down the ****ter. i think my new turbo setup killed mine.

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Old

Jul 21, 2004 | 12:32 PM

#9

NOLAN5162

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Yeah , i cleared it and it came back. So is it the o2 sensor or the cat?

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Old

Jul 21, 2004 | 12:41 PM

#10

NOLAN5162

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also would the cat going south account for the rattling sound i described earlier?

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