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  1. #1
    Veteran Member Three Rings AudiHolicS4's Avatar
    Join Date
    Apr 16 2008
    AZ Member #
    27781
    Location
    Pasadena, MD

    Help with MAF sensor!!!

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    well i recently just put on downpipes and a catback on my car and i had no check engine lights before this install and when i get done the CEL pops on and i read it for codes im guessing it was the rear o2 sensors and the defoulers werent working but all im getting are mass air flow sensor codes and a primary o2 pre cat with no activity would changing an exhaust cause these to go bad or did they just go bad from age and wear please help and if anybody has a bosch MAF they wanna get rid of pm me TIA for help
    2000 Silver S4

  2. #2
    Veteran Member Four Rings RolledMySTi's Avatar
    Join Date
    Jul 06 2007
    AZ Member #
    19342
    My Garage
    2001 S4 Sedan Laser Red
    Location
    San Jose, CA

    Re: Help with MAF sensor!!!

    The O2 codes could be from improper installation or damage during the dp install.
    01 Laser Red S4 Stage 3 | Vast Fueling | Clutchnet 6 Puck Disk with RS4 PP | APR Downpipes | Aluminum Flywheel | Neuspeed Exhaust | SRM Side Mounts | ECS Pulley Kit | RS4 Airbox | UUC Short Shifter | ST Coilovers| Samcos | AWE DTS Bar | JHM Center Diff | 034 Track Motor Mounts + Street Trans Mounts | Apikol blue rear diff mount and bushings | Areomotive Fuel Pump | ECS 2.0T Coil Conversion | Hooked on Meth

  3. #3
    Veteran Member Four Rings Evilevo's Avatar
    Join Date
    May 26 2008
    AZ Member #
    29219
    My Garage
    2018 TTRS, 2014 Q5 TDI, 2020 Supra, 2022 F150, 2004 V70R
    Location
    MD

    Re: Help with MAF sensor!!!

    Quote Originally Posted by AudiHolicS4 View Post
    well i recently just put on downpipes and a catback on my car and i had no check engine lights before this install and when i get done the CEL pops on and i read it for codes im guessing it was the rear o2 sensors and the defoulers werent working but all im getting are mass air flow sensor codes and a primary o2 pre cat with no activity would changing an exhaust cause these to go bad or did they just go bad from age and wear please help and if anybody has a bosch MAF they wanna get rid of pm me TIA for help
    Your screwed ;)

    Do you have a bad exhaust leak?

    I have a bunch of Hitatchi MAFs and 2 extra housings if you want to do the conversion

  4. #4
    Veteran Member Three Rings AudiHolicS4's Avatar
    Join Date
    Apr 16 2008
    AZ Member #
    27781
    Location
    Pasadena, MD

    Re: Help with MAF sensor!!!

    Quote Originally Posted by Evilevo View Post
    Your screwed ;)

    Do you have a bad exhaust leak?

    I have a bunch of Hitatchi MAFs and 2 extra housings if you want to do the conversion
    no i had an exhaust leak but i got it fixed i know they have a thread on converting from bosch to hitatchi but what all would i need to do that?
    2000 Silver S4

  5. #5
    Veteran Member Four Rings Evilevo's Avatar
    Join Date
    May 26 2008
    AZ Member #
    29219
    My Garage
    2018 TTRS, 2014 Q5 TDI, 2020 Supra, 2022 F150, 2004 V70R
    Location
    MD

    Re: Help with MAF sensor!!!

    Quote Originally Posted by AudiHolicS4 View Post
    no i had an exhaust leak but i got it fixed i know they have a thread on converting from bosch to hitatchi but what all would i need to do that?
    i have NO clue, i have 2001.5 already mang ;)

    They prolly list what you need in the thread. Clear your CEL and see if it comes back

  6. #6
    Veteran Member Three Rings AudiHolicS4's Avatar
    Join Date
    Apr 16 2008
    AZ Member #
    27781
    Location
    Pasadena, MD

    Re: Help with MAF sensor!!!

    well i actually just did that to check what would happen and ill let you know as soon as i notice if it comes on but my friend just has a little code reader ad these are the codes
    P1117
    P0102
    P1115
    P1114
    P1140
    P1119
    P1425
    P1530
    P1122
    ;) who knew it would so many but from what i can tell is most of them are MAF codes then one no activity 02 code and i think for the conversion i would have to buy an ecu???
    2000 Silver S4

  7. #7
    Veteran Member Four Rings Evilevo's Avatar
    Join Date
    May 26 2008
    AZ Member #
    29219
    My Garage
    2018 TTRS, 2014 Q5 TDI, 2020 Supra, 2022 F150, 2004 V70R
    Location
    MD

    Re: Help with MAF sensor!!!

    Quote Originally Posted by AudiHolicS4 View Post
    well i actually just did that to check what would happen and ill let you know as soon as i notice if it comes on but my friend just has a little code reader ad these are the codes
    P1117
    P0102
    P1115
    P1114
    P1140
    P1119
    P1425
    P1530
    P1122
    ;) who knew it would so many but from what i can tell is most of them are MAF codes then one no activity 02 code and i think for the conversion i would have to buy an ecu???
    Wow, im kinda lazy right now to look up what those codes are. If you come to the Supra meet on friday night i can use my VaginaCom and pull the codes with it. I dont think you need a ECU for the conversion. I know you do the conversion when you go stage 3 unless you go APR, so that would help for the future too. I would look into the conversion more, i was just throwing this out there.

  8. #8
    Veteran Member Three Rings AudiHolicS4's Avatar
    Join Date
    Apr 16 2008
    AZ Member #
    27781
    Location
    Pasadena, MD

    Re: Help with MAF sensor!!!

    yea thats cool ill let you know about the switch ill check up on it some more and find out what i need
    2000 Silver S4

  9. #9
    Veteran Member Four Rings Evilevo's Avatar
    Join Date
    May 26 2008
    AZ Member #
    29219
    My Garage
    2018 TTRS, 2014 Q5 TDI, 2020 Supra, 2022 F150, 2004 V70R
    Location
    MD

    Re: Help with MAF sensor!!!

    Quote Originally Posted by AudiHolicS4 View Post
    yea thats cool ill let you know about the switch ill check up on it some more and find out what i need
    Does the car drive smooth? How does it drive if you unplug the MAF?

  10. #10
    Veteran Member Three Rings AudiHolicS4's Avatar
    Join Date
    Apr 16 2008
    AZ Member #
    27781
    Location
    Pasadena, MD

    Re: Help with MAF sensor!!!

    idk i never tried unplugging but to me it drives good i mean it smells like its running rich but i figured that was due to the primary o2 being bad cause one code said its not getting any activity from bank 1 sensor 1
    2000 Silver S4

  11. #11
    Veteran Member Four Rings Klum00's Avatar
    Join Date
    Nov 27 2006
    AZ Member #
    13703
    Location
    Baltimore, MD

    Re: Help with MAF sensor!!!

    adam you still have some spare MAF's? mine died today when I was running a vette.

    thought it was a boost leak at first but all my IC hoses were fine. unplugged the MAF and the car runs fine...

    Quattro Kings
    @quattroking
    -
    Currently in the garages
    2016 S6 . 2014 RS5 cab . 2013 Q5 . 2008 A6 avant
    2002 TT ALMS . 2001 S4 . 1992 UrS4 . 1974 100 LS
    1952 DKW RT125 . 1939 DKW F8 . 1937 DKW F7

  12. #12
    Veteran Member Three Rings tbone5446's Avatar
    Join Date
    Nov 16 2006
    AZ Member #
    13455
    My Garage
    b5s4, 85 4runner T3/T4 turboed
    Location
    San Diego

    Re: Help with MAF sensor!!!

    I have a bosch maf if anyone is interested.
    I bought it and never used it, it is brand new housing and sensor.
    make me an offer and I will ship it out
    ALready boxed up

  13. #13
    Veteran Member Four Rings Klum00's Avatar
    Join Date
    Nov 27 2006
    AZ Member #
    13703
    Location
    Baltimore, MD

    Re: Help with MAF sensor!!!

    i got the hitachi.

    just cleaned it out. letting it dry and then i'll see how it goes....

    Quattro Kings
    @quattroking
    -
    Currently in the garages
    2016 S6 . 2014 RS5 cab . 2013 Q5 . 2008 A6 avant
    2002 TT ALMS . 2001 S4 . 1992 UrS4 . 1974 100 LS
    1952 DKW RT125 . 1939 DKW F8 . 1937 DKW F7

  14. #14
    Veteran Member Four Rings Klum00's Avatar
    Join Date
    Nov 27 2006
    AZ Member #
    13703
    Location
    Baltimore, MD

    Re: Help with MAF sensor!!!

    Yeah so cleaning the MAF didn't help for shit. I'm going to re-check ALL my hoses again today just to make sure. It just seems weird that the MAF would die all of a sudden, the car had been idling fine.

    Adam, please bring that MAF to the TFT show. I'll see if that helps. Thanks!

    Quattro Kings
    @quattroking
    -
    Currently in the garages
    2016 S6 . 2014 RS5 cab . 2013 Q5 . 2008 A6 avant
    2002 TT ALMS . 2001 S4 . 1992 UrS4 . 1974 100 LS
    1952 DKW RT125 . 1939 DKW F8 . 1937 DKW F7

  15. #15
    Veteran Member Four Rings Evilevo's Avatar
    Join Date
    May 26 2008
    AZ Member #
    29219
    My Garage
    2018 TTRS, 2014 Q5 TDI, 2020 Supra, 2022 F150, 2004 V70R
    Location
    MD

    Re: Help with MAF sensor!!!

    Are you throwing any codes? I'll bring the MAF and my VAGinaCOM

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