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Thread: For anyone thinking about removing the SAI (Secondary Air Injection) system

  1. #19
    Registered User hahnmgh63's Avatar
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    But have you disconnected the pump connection to see if you still get the code? As I said, mine is disconnected and I don't get a code, the only code I got was for the SAI Solenoid valve on the intake manifold before I replugged it in.
    2003 White RS6 2013 Midnight Blue S5
    2013 Daytona RS5 2x944 Turbo's 1974 911 w/'91 3.6ltr motor
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  2. #20
    Registered User ttboost's Avatar
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    No I haven't. I guess I will unplug the pump or solenoid, reset the light, and drive it and see if the codes come back. Does it matter if you disconnect the pump or the solenoid?
    2013 Audi S8

  3. #21
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    I think the code only appears when the ECU tries to turn on the pump. This is why I think a resistor might help with that.

    I still have the plug for my solenoid valve plugged in as I recall getting codes with it unplugged.

    BTW, I still have a good SAI pump if you need one. PM me.
    2012 Q7 TDI S-Line - 2010 GTI - 2007 A3 3.2 S-Line - 2003 RS6
    2001 Honda S2000 - 1977 Honda CBR 750-F2 - 1965 GMC 1500 WideSide

  4. #22
    Registered User hahnmgh63's Avatar
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    With both the pump & solenoid valve unplugged I got a code for the solenoid. With the solenoid valve plugged in (but vacuum hose looped from port to port on the solenoid) and the pump still unplugged I have no codes, maybe I need to drive it a few more miles to see but before it would throw a CEL shortly after startup.
    2003 White RS6 2013 Midnight Blue S5
    2013 Daytona RS5 2x944 Turbo's 1974 911 w/'91 3.6ltr motor
    Roy, WA

  5. #23
    Registered User SzymekCRX's Avatar
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    AFAIK the ECU determines whether the SAI is working properly using the O2 sensor so it is not easy to fool it

  6. #24
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    FWIW - my SAI pump was left unplugged at the solenoid and I never got a CEL immediately. I did get it after 3-5 restarts though, every time. Plugged it back in and no more CEL and light. Not sure if that experience will help
    -Greg
    2003 RS6

  7. #25
    Registered User 1 bad 03 rs6's Avatar
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    Quote Originally Posted by hahnmgh63 View Post
    If you are interested I do have my SAI air pump, that is if you really miss that sound. What is your SAI fault code? It isn't showing the N112 valve is it? Or is it showing J299 or V101?
    You do still have your SAI pump? I think the CEL I get is the N112 valve, but the pump sounds a little sick. Rattling noise. At least that was what it has been the last couple of times the CEL came on. It comes and goes. I think that was the code that showed up when you checked on my car.

  8. #26
    Registered User hahnmgh63's Avatar
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    I still have my pump but there is a chance that it is sold, there is a 4.2 A6 guy on Audizine interested but I haven't heard back from him since last week but I also told him that I was in no hurry.
    2003 White RS6 2013 Midnight Blue S5
    2013 Daytona RS5 2x944 Turbo's 1974 911 w/'91 3.6ltr motor
    Roy, WA

  9. #27
    Registered User hahnmgh63's Avatar
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    Took the car for a 40 mile drive tonight and I got a CEL. Thought maybe I would have to eat my words about no codes for the SAI system but alas I don't have to:

    2 Faults Found:
    16815 - Warm Up Catalyst; Bank 2
    P0431 - 001 - Efficiency Below Threshold - MIL ON
    16523 - Oxygen (Lambda) Sensor B1 S2
    Since I am Catless that answers both questions I think. I still may try the O2 extenders but I'm going to be gone the month of January so I'll plan on getting my Viper tune in February. Funny that I have already had the O2 for Bank1 secondary before but it hasn't thrown a code for Band 2 and they are all new sensors. Maybe a tolerance issue with the sensor of just a placement in the exhaust. They are both opposite each other in the Millteks.
    2003 White RS6 2013 Midnight Blue S5
    2013 Daytona RS5 2x944 Turbo's 1974 911 w/'91 3.6ltr motor
    Roy, WA

  10. #28
    Registered User RAUDI's Avatar
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    Does this valve just get removed if the said is bypassed with the ecu programming?
    2004 S4 Avant - 2003 Avus Silver RS6 MT (sold)
    Public link to Onedrive.com 6MT Files
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  11. #29
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    If you don't remove the pump, valves, and associated weight why would you disconnect it? Thing 1 is all stock....Thing 2 has the SAI delete with the 034 blockoff plates. Thing 2 had a CEL the first hundred miles or so, but hasn't come back.

  12. #30
    Registered User ttboost's Avatar
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    I removed EVERYTHING, installed block-off plates and had SAI coded out by my tuner. NEVER had an issue, drivability-wise, emissions-wise, or code-wise.
    2013 Audi S8

  13. #31
    Registered User RAUDI's Avatar
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    Thanks guys. I removed the pump. Egrs and all piping. Installed the 034 plates. Getting it codes it with tune. So tttboost. Are you saying yes to removing the switch? I can't remember it's title. In on my phone.
    2004 S4 Avant - 2003 Avus Silver RS6 MT (sold)
    Public link to Onedrive.com 6MT Files
    https://1drv.ms/f/s!AjZTWt7Mgp7SiVfliUkt64Ao6iSE

  14. #32
    Registered User ttboost's Avatar
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    Sorry correction.... it just came to me....I DID leave my SAI solenoid plugged in...but only so I wouldn't have a connector just laying around collecting crud. If you are coding it out, you can disconnect and remove solenoid if you wish.
    2013 Audi S8

  15. #33
    Registered User RAUDI's Avatar
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    Quote Originally Posted by ttboost View Post
    Sorry correction.... it just came to me....I DID leave my SAI solenoid plugged in...but only so I wouldn't have a connector just laying around collecting crud. If you are coding it out, you can disconnect and remove solenoid if you wish.

    Thank you. More decisions. I don't like crud or extra things under the hood.
    2004 S4 Avant - 2003 Avus Silver RS6 MT (sold)
    Public link to Onedrive.com 6MT Files
    https://1drv.ms/f/s!AjZTWt7Mgp7SiVfliUkt64Ao6iSE

  16. #34
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    Quote Originally Posted by RAUDI View Post
    Thank you. More decisions. I don't like crud or extra things under the hood.
    I deleted my SAI cause the wires to the fan were cracked and ready to catch fire :/ (they are big), as for extra crud or things under the hood....deleted the fogs with the Wags and the aux rads....Thing 2 works just fine!

  17. #35
    Registered User RAUDI's Avatar
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    Quote Originally Posted by 905084 View Post
    I deleted my SAI cause the wires to the fan were cracked and ready to catch fire :/ (they are big), as for extra crud or things under the hood....deleted the fogs with the Wags and the aux rads....Thing 2 works just fine!
    I have the SAI (the solenoid is still in) and aux rads out already. I think the wags are happening right after the 6mt adapter purchase.
    2004 S4 Avant - 2003 Avus Silver RS6 MT (sold)
    Public link to Onedrive.com 6MT Files
    https://1drv.ms/f/s!AjZTWt7Mgp7SiVfliUkt64Ao6iSE

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