PO491 & PO492

Discussion in 'Import Vehicles' started by Jim Fairbanks, Nov 3, 2017.

  1. Jim Fairbanks

    Jim Fairbanks wrench

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    MAKE:Audi
    MODEL:Q7
    YEAR:2011
    MILES:
    ENGINE:3.0 SC
    DESCRIBE ISSUE....Hey guys...I have a 2011 Audi with the secondary air injection system codes in here...The fuse is good the relay is good and the pump runs...I have checked the lines going from the pump and don't hear any leaks...I reset it a few times and drive it but the codes keep coming back...I am not sure what else to check on this thing....anybody have any ideas what I can try next...Thanks for the help....Jim
     
  2. kev2

    kev2 wrench

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    this popped up on quick ck- one TSB for both #s a likely suspect.

    SORRY I did not read it - hvn't had coffee and its 15 pages of german BS
     

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  3. nickb2

    nickb2 Wrench. I help when I can

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    Ha, if car drives ok, ignore those codes. More a hassle to remove them with the above TSB. Not something you can jerry rig easily to clean out those ports with your everyday power washer. This is an emission code, but from what I understand, you live in a state with emission testing, does this super charged luxury car need emission testing soon?

    In principle, there should be no drive-ability issues when these codes are present.

    You could try a few bottles of cataclean or something similar in the tank and drive the wheels off it for a while and do a very through carbon flush with a good solvent for these sensitive engines. It may help disappear those codes prior to emission testing.
     
    Last edited: Nov 4, 2017
  4. nickb2

    nickb2 Wrench. I help when I can

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    Basically you want to attack the carbon buildup in the system which is causing a insufficient flow code on both banks at same time.

    I think it would be best to try to inject some solvent in the secondary system prior to the two pumps. Maybe at the secondary air injection solenoid valves. They are prior to the whole system and may have the best ports to use to get the solvent in there and have the best chance of cleaning all the insides that the TSB refers to. My take is that they are gummed up with a shyte load of carbon as most audi and german cousins tend to do. You should see the inside of an oil pan when I do audi with turbos. The carbon build up from the return oil lines is crazy when a turbo fails.

    This being a super charged, not so worried about that.

    Maybe try running some cataclean or similar straight through to solenoid ports in a concentrated way. https://www.4wheelparts.com/Perform...MIpIv6hrGl1wIVGLjACh2OcA94EAYYASABEgLapPD_BwE
     
  5. Jim Fairbanks

    Jim Fairbanks wrench

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    Thanks Nick....I will check it out...Jim
     
  6. nickb2

    nickb2 Wrench. I help when I can

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    How you doing BTW Jim? Good?
     
  7. Jim Fairbanks

    Jim Fairbanks wrench

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    Hey Nick....Yes, I am doing ok...thanks for asking...trying to stay busy and start working on cars again...Jim
     

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