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Anyone ever got this code?

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Old 07-21-2004, 07:56 AM
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Default 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 07-21-2004, 08:24 AM
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Default 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 07-21-2004, 08:24 AM
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Default 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 07-21-2004, 08:52 AM
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Default 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 07-21-2004, 08:56 AM
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Default 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 07-21-2004, 09:10 AM
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Passenger side. or on a 1.8t, the only side.
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Old 07-21-2004, 09:11 AM
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clear it and see if it comes back first
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Old 07-21-2004, 10:20 AM
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Default 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 07-21-2004, 12:32 PM
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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 07-21-2004, 12:41 PM
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also would the cat going south account for the rattling sound i described earlier?
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