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  1. #1
    Veteran Member Three Rings bengtc's Avatar
    Join Date
    Mar 13 2009
    AZ Member #
    39818
    My Garage
    2012 S4
    Location
    Dallas

    Check Engine Light came on after car wash?

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    My check engine light came on after I took it through the car wash. There are no leaks or nothing weird sounding from the engine. Does anyone have any ideas what it could be?? Thanks!

  2. #2
    Registered Member Four Rings B6JoeS4's Avatar
    Join Date
    Sep 13 2008
    AZ Member #
    32998
    My Garage
    Terminator Cobra
    Location
    Chicago NW Burbs

    Re: Check Engine Light came on after car wash?

    you could have gotten some water on your maf. that will cause a cel. try scanning for codes

  3. #3
    Senior Member Three Rings pyrobecks's Avatar
    Join Date
    Oct 05 2006
    AZ Member #
    12326
    My Garage
    '06 A4 2.0TQ Prem/S-Line
    Location
    SoCal - Pasadena

    Re: Check Engine Light came on after car wash?

    Did you by chance fill your car up with gas before the car wash? I had a CEL when I didn't close the fuel door (or was it cap) tight enough?
    ~ pyrobecks


    06 A4 2.0T Quattro Tip | Premium | DTM
    Stasis SS's > RS4 Rear Sway > VM Onyx Black 19” RS4 Reps > Black Optic DTM Grill >
    Smoked Corner and Side Markers > Audi Sport Floor Mats > Euro OEM Clear Corner Xenon's > VAGged

  4. #4
    Established Member Two Rings snackbarber's Avatar
    Join Date
    Jan 03 2009
    AZ Member #
    37011
    My Garage
    2001.5 S4 brilliant black, 2006 B7 A4 Ocean Blue Metallic Stage 2+
    Location
    Hood River, OR

    Re: Check Engine Light came on after car wash?

    Did you use the pressure washer to clean the engine bay? That seems to be a bad idea on these cars. There are numerous posts where detailers/dealers/owners have cleaned the engine bay only to find that the coil packs got wet and started to fail. If you are under warranty I would just take it to the dealer and have them sort it out. If not get yourself a vagcom cable(or meet up with someone who already has one).
    B5 S4 \\\ JHM DTS | SSAC non-res twin two turbo back | J-Fonz Stage 2 or NotoriousVR w/no egt or o2 | STE PPD

    B7 A4 \\\ GIAC stage 2+ | APR HPFP | AWE FMIC | HPFP 145 Bar PRV | Stasis exhaust | 034 HFC | Bilstein PSS9 | Gunmetal VMR v701 | RS4 rear sway | BSH Stage 2 PCV

  5. #5
    Senior Member Three Rings wayneB7's Avatar
    Join Date
    Nov 28 2008
    AZ Member #
    35763
    My Garage
    2005.5 Audi A4 2.0T
    Location
    Houston, TX

    Re: Check Engine Light came on after car wash?

    Quote Originally Posted by bengtc View Post
    My check engine light came on after I took it through the car wash. There are no leaks or nothing weird sounding from the engine. Does anyone have any ideas what it could be?? Thanks!
    Sounds like you might have had an underbody wash, did you?

    Something electrical might have got wet, and while I have no way of knowing what it is, I am sure interested in knowing what the culprit actually turned out to be, since I occasionally go through a car wash with underbody spray.

    Good luck.
    Best Regards,
    Wayne | Houston, TX | 2005.5 Audi A4 2.0T FrontTrak CVT in Brilliant Red, Premium & Lighting Packages
    Stock+APR 93, Forge DV, S4 20mm rear stabilizer bar, K&N panel filter

  6. #6
    Established Member Two Rings
    Join Date
    Dec 14 2006
    AZ Member #
    14202
    My Garage
    2007 Audi A4 S-Line
    Location
    Long Island, New York

    Re: Check Engine Light came on after car wash?

    THis happened to my Durango. I thought it was from the undercarraige section. I know it's a different car/truck all together, but I let everything dry, reset the battery and it never came on again (the rest of the POS truck fell apart though).
    Audi: pwn teh r04d

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  7. #7
    Veteran Member Four Rings FastB7S4's Avatar
    Join Date
    Mar 01 2008
    AZ Member #
    25915
    My Garage
    12 CC Lux Ltd, 11 Touareg, Mk3.5 Cabrio
    Location
    ChesCo, Lancaster, PA

    Re: Check Engine Light came on after car wash?

    i've had coil pack failures after a car wash and then during rainy, foggy weather. the older model coilpacks (black top) were prone to failure due to a faulty seal that allowed moisture to get in and cause them to fail.

    not sure what your issue could be since you say the engine sounds normal. you'd know if it was a coilpack. engine would run rough and sputter along with a definitel loss of power.
    /S4
    AWE l Koni l H&R l Hotchkis l VMR l LEDs by fly

  8. #8
    Veteran Member Three Rings bengtc's Avatar
    Join Date
    Mar 13 2009
    AZ Member #
    39818
    My Garage
    2012 S4
    Location
    Dallas

    Re: Check Engine Light came on after car wash?

    Thanks for all the replies! I had the car inspected about a week ago and there were no problems and I took it through a touchless auto car wash yesterday. I t had the undercarriage cleaned by the car wash. How do I reset the battery maybe that will clear the light?

  9. #9
    Veteran Member Three Rings Msu2312's Avatar
    Join Date
    Jan 17 2009
    AZ Member #
    37528
    My Garage
    scooter?
    Location
    Los Angeles

    Re: Check Engine Light came on after car wash?

    i would just unplug the negative wait a few mins and plug it back in that will clear your light
    ...2008 A4 2.0T S-Line...
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