A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

o2/cat 16805 update - interesting......

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Old 04-30-2007, 07:36 PM
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Default o2/cat 16805 update - interesting......

I'v had a 16805 bank 1 warm up cat / 17521 bank 1 int reses to large / 17539 bank 2 int reses to large

so, I replaced the first set of 02's....this cleared the 17521 and 17539.... but I still had the 16805....so I decided to swap (per a suggestion) the rear 02s.....interested.....i got 16815 bank 2 warm up cat - so I'm thinking its the 02 sensor and not the cat....but I also got a new cod 17584 - bank 1 lambda correction downstream of catalyst contol limit attained....what the heck is this? tx, jeff
Old 04-30-2007, 07:58 PM
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Default Sounds like the sensor downstream of Cat 1 currently, is bad -

or cat 1 is bad. Or both those sensors are bad. Wierd.
Old 04-30-2007, 07:58 PM
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Sorry, just realised how useless my post above is!
Old 04-30-2007, 08:21 PM
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Default Hmm, sounds familiar.

I'm getting the same code on my S4. I have done nothing to troubleshoot yet, so I'm really interested to see what you come up with.
Would it help either of us if I had mine smogged? Maybe that would rule out a bad cat?
Mine:
16815 - Warm Up Catalyst; Bank 2: Efficiency Below Threshold
P0431 - 35-10 - - - Intermittent
Old 05-01-2007, 10:05 AM
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strange how two different codes are both related to the o2 sensors...
Old 05-03-2007, 06:31 PM
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Default I passed smog with my code.

I figured that I had a bad cat, but now I guess not.
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