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  1. 16804 issue 
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    Hi all
    I've got a 2006 A4 1.8t and can't get rid of the code permanently. I can clear it but engine light pops back up after a few days.
    Code is catalyst system, bank 1efficiency below threshold. Sporadic.
    I ran a test on the vag401 and it said the sensors were ok and the cat was the problem, I changed this and the sensors as I didn't fancy getting involved with it again! I've run cat cleaner through it too, no obvious split pipes either.
    Code still here so any ideas?

    Cheers D
     
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  2. Re: 16804 issue 
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    You could be barking at the code here

    16804 (P0420)- Catalyst System; Bank 1: Efficiency Below Threshold

    Have you replaced the lambda sensor after the cat or the one before?
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  3. Re: 16804 issue 
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    Crasher I have done both. I guess a new one could be at fault though.
     
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  4. Re: 16804 issue 
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    IF you have replaced the sensors with proper Bosch/genuine items AND there are no other fault codes, the ECU MAY be telling the truth and the cat is sick, but is is highly unusual with genuine cats so it would be a good idea to investigate if it is a genuine cat but it may be hard for you to tell. I could possibly tell if I saw some pictures.
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  5. Re: 16804 issue 
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    Hi
    I've run tests today and the sensors are good but the new cat isn't. It was an after market cat so I'll get in touch with the supplier. I didn't want to change it again as it was a pig of a job!
     
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