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  1. #1
    Junior Member Two Rings
    Join Date
    Sep 10 2020
    AZ Member #
    564028
    Location
    Phoenix area

    No DTC's but 2 Readiness won't come ready, OBD 11 diagnostics shows tank leaks.

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    I have been struggling with finding what my issues are caused by. I failed emissions as 2 of my Readiness monitors won't come ready. I can see using the OBDEleven scan tool which 2 they are: Monitoring of Air Injection and Monitoring of Tank ventilation. It should be noted I did swap out the engine late last summer and aside from having to replace the battery as it sat a very long time, it's been running fine since with no codes. When I say no codes, I mean, yes, a few oops, I didn't plug this in or tighten this hose up codes, but I cleared them and aside from having to replace the battery as it sat a very long time, it ran fine. So I know the system is able to read faults as not only were therre initial faults after swapping the motor, but I did get one or 2 since then. I have put about 12000-1500 miles on it since the the engine swap. I have put about 12000-1500 miles on it since then. So having only owned this car since November 2022, it passed the first emissions, but my 2 year mark was this November and that is when I failed. So as far as I know, I have had this issue since swapping the engine. The car runs fine and I have no DTC's, and yes, the light works. So I researched a bit and found it's possible I have weak OO2 sensors can cause this, but not weak enough to flag a DTC. In my case I was lead to replacing the 2 Upstream (pre-cat) ones. This didn't help. Further diagnostics with the OBDEleven I ran tests and I am getting some errors related to tank leaks. But why no codes?
    Here are the screenshots of the OBDEleven tests and scans. Any ideas on what would need repair/replacement?

    ZomboDroid_30012025124520.jpg Screenshot_20250131-175817.jpg
    Last edited by tjlmbklr; 02-04-2025 at 01:54 PM.

  2. #2
    Active Member One Ring
    Join Date
    Oct 20 2021
    AZ Member #
    634906
    Location
    NJ

    Tank leak messages would lead me to believe it could be vapor canister issue or something. Do you have access to VAGCOM? I found this: https://www.ross-tech.com/vag-com/m_blocks/070-079.html
    2021 SQ8 | Orca Black | 42K Miles

  3. #3
    Junior Member Two Rings
    Join Date
    Sep 10 2020
    AZ Member #
    564028
    Location
    Phoenix area

    Quote Originally Posted by CYANiD3 View Post
    Tank leak messages would lead me to believe it could be vapor canister issue or something. Do you have access to VAGCOM? I found this: https://www.ross-tech.com/vag-com/m_blocks/070-079.html
    This was scanned with OBDEleven, a phone app tool with a lot of the same features as VAGCOM/VCDS, a bit dumbed down tough. I have looked into getting VAG, but I don't see what interface is available for the 2017/4M model Q7. I have a friend who has it that I used many times on older VW's but it won't interface with my Audi's newer system.

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