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    Thread: Need help here....16804-catalyst system efficiency bellow threshold....seconday air injection failed

    1. 03-22-2004 03:20 PM #1
      I got 1 DTC's that I have been trying to figure out for the longest time now....
      16804-Catalyst system efficiency below threshold (Bank 1)
      35-00--
      And I have been testing the readiness ever since and finally today I logged, a fail....
      it says readiness status=00001000
      seconday air injection : failed or incomplete....
      can anyone help me with this info?
      Mark

    2. Member JM1681's Avatar
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      03-22-2004 04:18 PM #2
      Does your intake allow for the secondary air pump? If not, I've heard that could attest to the "air injection" code

    3. 03-22-2004 05:47 PM #3
      i had the 16804 code & one more...faulty cat was the reason, replaced under emissions warranty!

    4. 03-22-2004 06:26 PM #4
      Quote, originally posted by JM1681 »
      Does your intake allow for the secondary air pump? If not, I've heard that could attest to the "air injection" code

      I do not know the answer to this question....Its a 2001 jetta 1.8t AWW...

    5. 03-22-2004 06:28 PM #5
      Quote, originally posted by the wolf »
      i had the 16804 code & one more...faulty cat was the reason, replaced under emissions warranty!

      yes but I passed the readiness test exept for the secondary injection system....
      what is the secondary air injection system?
      Mark

    6. Member RonN's Avatar
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      03-22-2004 08:09 PM #6
      16804 is caused primarily by most of us having aftermarket exhaust. o2 sensor #1 is cooling off too fast causing the code to trigger the check engine light.

    7. 03-22-2004 09:01 PM #7
      the exhaust system is completely stock....all the car has is a chip
      MArk

    8. 03-23-2004 03:55 PM #8
      help

    9. Member JettaRed's Avatar
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      03-23-2004 04:24 PM #9
      I had it (or was it 16803?). I replaced the O2 sensor (approx. $30). 021906262B for the six wire (front) and 06A906262Q for the 4 wire rear. You can also use 06A906262Q for the front (bank 1) if it's 4 wire.
      the cheapest place is http://www.1stvwparts.com
      2004 Audi TT225 GIAC, DevilsOwn W/M, Modshack MOFO & VTDA, 42DD 3" DP, Neuspeed 19mm Rear Sway, Haldex Blue
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      2001 Audi A4 1.8TQ Dead 2000 Jetta Supercharged 2.0 Dead 2003 GTI Sold

    10. 03-23-2004 04:39 PM #10
      Quote, originally posted by JettaRed »
      I had it (or was it 16803?). I replaced the O2 sensor (approx. $30). 021906262B for the six wire (front) and 06A906262Q for the 4 wire rear. You can also use 06A906262Q for the front (bank 1) if it's 4 wire.
      the cheapest place is http://www.1stvwparts.com

      had you passed the emissions tesT?
      thanks
      Mark

    11. 03-23-2004 06:40 PM #11
      help guys

    12. 03-23-2004 06:48 PM #12
      Have you tried clearing the code? How long did it take to return?

    13. 03-23-2004 07:28 PM #13
      I clear it and it comes back in 2-3 days....depending on how long I drive
      Mark

    14. Member Junk T.I.'s Avatar
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      03-23-2004 08:04 PM #14
      Mark
      the cat fault is as it seems, your cat is probably bad.... and needs replacement
      which is covered under the 8/80 emissions warranty as long as you have replaced plugs around 40k miles( I am not sure if you are that high in mileage)
      as for the secondary air incorrect flow.... 99.9% of the time its a broken vac hose..... but it could be a bad air pump, bad Combi valveor whatever.....
      01 GTI 1.8T big turbo ghost...
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    15. Member JettaRed's Avatar
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      03-23-2004 08:37 PM #15
      My CEL was also coming on about twice a week. All the readiness codes were PASSED, but I still got the DTC. I swapped the before cat O2 sensor, but it hasn't been long enough to see if it comes back.
      Again, the bentley says to replace the O2 sensor; it doesn't say anything about replacing the cat. Plus if the problem is BEFORE the cat (i.e., Bank 1), then why would you replace the cat?
      2004 Audi TT225 GIAC, DevilsOwn W/M, Modshack MOFO & VTDA, 42DD 3" DP, Neuspeed 19mm Rear Sway, Haldex Blue
      2002 GTI 337 Revo Custom, CAI, FMIC, Modshack MOFO, TT225 MAF & Injectors, DevilsOwn W/M, GHL 3" TurboBack
      2001 Audi A4 1.8TQ Dead 2000 Jetta Supercharged 2.0 Dead 2003 GTI Sold

    16. 03-23-2004 08:47 PM #16
      Quote, originally posted by JettaRed »
      My CEL was also coming on about twice a week. All the readiness codes were PASSED, but I still got the DTC. I swapped the before cat O2 sensor, but it hasn't been long enough to see if it comes back.
      Again, the bentley says to replace the O2 sensor; it doesn't say anything about replacing the cat. Plus if the problem is BEFORE the cat (i.e., Bank 1), then why would you replace the cat?

      what I don't understand is how can I figure out what to change....do I just start changing sensors randomly and hope that the dtc doesn't come back?
      thanks for your help guys...VERY APPRECIATED
      Mark

    17. Member JettaRed's Avatar
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      03-23-2004 08:59 PM #17
      There is only one precat sensor and one post-cat sensor. Precat is Bank 1 and post-cat is Bank 2. The DTC is pretty specific as to which O2 sensor has the problem.
      2004 Audi TT225 GIAC, DevilsOwn W/M, Modshack MOFO & VTDA, 42DD 3" DP, Neuspeed 19mm Rear Sway, Haldex Blue
      2002 GTI 337 Revo Custom, CAI, FMIC, Modshack MOFO, TT225 MAF & Injectors, DevilsOwn W/M, GHL 3" TurboBack
      2001 Audi A4 1.8TQ Dead 2000 Jetta Supercharged 2.0 Dead 2003 GTI Sold

    18. 03-23-2004 09:30 PM #18
      Quote, originally posted by JettaRed »
      There is only one precat sensor and one post-cat sensor. Precat is Bank 1 and post-cat is Bank 2. The DTC is pretty specific as to which O2 sensor has the problem.

      I'll change that sensor when I get a chance...is the sensor, the part number you posted above?
      thanks
      MArk

    19. 03-24-2004 07:30 AM #19
      any other insight?

    20. 03-24-2004 06:45 PM #20
      up

    21. Member JettaRed's Avatar
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      03-24-2004 07:56 PM #21
      Quote, originally posted by Dubbin_vr6 »
      I'll change that sensor when I get a chance...is the sensor, the part number you posted above?
      thanks
      MArk

      Actually, those part numbers were for an AWP engine. The AWW engine uses the same for front and rear. You need part number 06A906262Q, which is only $16.22 from http://www.1stvwparts.com. (List is $21.63; so it may be cheaper to pay list from the dealer.)
      2004 Audi TT225 GIAC, DevilsOwn W/M, Modshack MOFO & VTDA, 42DD 3" DP, Neuspeed 19mm Rear Sway, Haldex Blue
      2002 GTI 337 Revo Custom, CAI, FMIC, Modshack MOFO, TT225 MAF & Injectors, DevilsOwn W/M, GHL 3" TurboBack
      2001 Audi A4 1.8TQ Dead 2000 Jetta Supercharged 2.0 Dead 2003 GTI Sold

    22. 03-25-2004 08:11 AM #22
      Quote, originally posted by JettaRed »
      Actually, those part numbers were for an AWP engine. The AWW engine uses the same for front and rear. You need part number 06A906262Q, which is only $16.22 from http://www.1stvwparts.com. (List is $21.63; so it may be cheaper to pay list from the dealer.)

      thanks for your help!
      Mark

    23. Member Junk T.I.'s Avatar
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      03-25-2004 11:37 AM #23
      Quote, originally posted by JettaRed »
      There is only one precat sensor and one post-cat sensor. Precat is Bank 1 and post-cat is Bank 2. The DTC is pretty specific as to which O2 sensor has the problem.

      just to clear this up.....
      on a 1.8T there is no bank 2....\
      what you will see is bank 1 sensor 1 or bank 1 sensor 2
      bank 1 sensor 1 is precat
      bank 1 sensor 2 is post
      only cars such as V6 style cars that have dual exhausts will have more than 1 bank...
      01 GTI 1.8T big turbo ghost...
      02 Jetta GLX
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    24. Member JettaRed's Avatar
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      03-25-2004 11:41 AM #24
      My error. thanks for the clarification.
      2004 Audi TT225 GIAC, DevilsOwn W/M, Modshack MOFO & VTDA, 42DD 3" DP, Neuspeed 19mm Rear Sway, Haldex Blue
      2002 GTI 337 Revo Custom, CAI, FMIC, Modshack MOFO, TT225 MAF & Injectors, DevilsOwn W/M, GHL 3" TurboBack
      2001 Audi A4 1.8TQ Dead 2000 Jetta Supercharged 2.0 Dead 2003 GTI Sold

    25. 03-25-2004 11:50 AM #25
      Quote, originally posted by Junk T.I. »
      just to clear this up.....
      on a 1.8T there is no bank 2....\
      what you will see is bank 1 sensor 1 or bank 1 sensor 2
      bank 1 sensor 1 is precat
      bank 1 sensor 2 is post
      only cars such as V6 style cars that have dual exhausts will have more than 1 bank...

      where does it say wihich sensor it is
      thanks
      Mark

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