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  1. #1
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    Question Mercedes MAF Sensor for a 110 TDI... is it better??

    Hey everyone not sure if this has been discussed much on here, but my MAF is dead on my A3 110 TDI doing a quick little google search found some people have used a MAF from a Mercedes CDI as they say its cheaper and runs better?? anyone got any experience of this and do they fit straight on?? nearly all of the searches i did were dated the early 2000's can someone help me out on where to get one and how much they may be now and do they work better?

    thanks

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    <tuffty/>'s Avatar
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    The ECU is calibrated to the MAF sensor designed for the car... buy the correct one for the car is my advice

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  4. #3
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    thats what i was thinking! but the OEM Bosch ones are so expensive.... i know they say you get what you pay for.. but will the cheaper MAF's be just as good? on Carparts4less they have the Bosch £62 Peirburg £110 MasterPro £39?

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    Quote Originally Posted by AmanDosangh View Post
    Hey everyone not sure if this has been discussed much on here, but my MAF is dead on my A3 110 TDI doing a quick little google search found some people have used a MAF from a Mercedes CDI as they say its cheaper and runs better?? anyone got any experience of this and do they fit straight on?? nearly all of the searches i did were dated the early 2000's can someone help me out on where to get one and how much they may be now and do they work better?

    thanks
    It used to be the 'in thing' to fit the merc maf to the TDI, or the pierburg aftermarket maf... While they are a little more robust than the Bosch hot wire maf, they do not read correctly across the rev range.

    The TDI has no lambda, and relies entirely on the MAF to determine fuelling so it's important you use the correct one.

    The newer Bosch MAF for the TDI is more reliable than the earlier ones were, just steer well clear of oiled air filters, you will gain no power by fitting one to the TDI. In fact you slowly loose power as the oil released coats the MAF element and gradually reduces the fuel injected.

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    Hey JimS3 thanks for your reply. i will look into it a little more. see if i can find a Bosch one on ebay for less then the £59 GSF want haha...(broke at the moment) im also getting limp mode too, reckon changing my MAF could sort that?

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    Quote Originally Posted by AmanDosangh View Post
    Hey JimS3 thanks for your reply. i will look into it a little more. see if i can find a Bosch one on ebay for less then the £59 GSF want haha...(broke at the moment) im also getting limp mode too, reckon changing my MAF could sort that?
    Possible, but limp mode on these is usually due to a vacuum leak to the turbo actuator or sticking VNT turbo mechanism. The usual fault code is 'pressure control deviation'.

    Get the fault codes read and that will give you more to go on.

    What makes you think your MAF is dead?

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    Quote Originally Posted by JimS3 View Post
    Possible, but limp mode on these is usually due to a vacuum leak to the turbo actuator or sticking VNT turbo mechanism. The usual fault code is 'pressure control deviation'.

    Get the fault codes read and that will give you more to go on.

    What makes you think your MAF is dead?

    I have changed all the vacuum pipes as a few of them did have holes in... Gonna check my actuator when i get a chance and see if sticky vains could be the issue!

    I tested my maf by running the car and then disconnecting the maf, there was no difference at all..my car has a slight rough idle and tends to kick alot of smoke on start up and runs rich on idle.

    Also had a vagcom readout awhile ago and the fault code i got was P1557 pressure control limit exceeded.

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    Quote Originally Posted by AmanDosangh View Post
    I have changed all the vacuum pipes as a few of them did have holes in... Gonna check my actuator when i get a chance and see if sticky vains could be the issue!

    I tested my maf by running the car and then disconnecting the maf, there was no difference at all..my car has a slight rough idle and tends to kick alot of smoke on start up and runs rich on idle.

    Also had a vagcom readout awhile ago and the fault code i got was P1557 pressure control limit exceeded.
    Sounds like the classic sticking vain problem.

    I would highly recommend getting the free version of VCDS (vag com) and a generic ebay cable if you plan on keeping the car a while. Saves so much guess work and expense.

    With vag com you can test the MAF in the measuring blocks. On your engine you should be looking for around 285 mg/st at idle and 850 mg/st at full boost. If it reads substantially lower than this, or defaults to the fail safe permanent 550 mg/st then the MAF needs replacing.

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    Quote Originally Posted by JimS3 View Post
    Sounds like the classic sticking vain problem.

    I would highly recommend getting the free version of VCDS (vag com) and a generic ebay cable if you plan on keeping the car a while. Saves so much guess work and expense.

    With vag com you can test the MAF in the measuring blocks. On your engine you should be looking for around 285 mg/st at idle and 850 mg/st at full boost. If it reads substantially lower than this, or defaults to the fail safe permanent 550 mg/st then the MAF needs replacing.
    Will a faulty MAF come up on the VagCom too or will i just know from the readouts.. How do i get a free copy of vagcom? Does it run off my laptop? And which cable is it on ebay?

    Seeing as there was no change in the running of my engine once the maf was disconnected.. Does this not show that the MAF is not working? Sorry to keep bothering you bit of a newby to all this

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    Doesn't necessarily mean your MAF is dead.

    Vag com (vcds) can be downloaded from their website Ross-Tech: VCDS-Lite: Download

    As for cable, this or similar from another seller is what you want:
    VAG Group USB com Port OBD2 II KKL ECU Diagnostic Cable Lead Work VCDS Lite 409 | eBay

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    Quote Originally Posted by JimS3 View Post
    Doesn't necessarily mean your MAF is dead.

    Vag com (vcds) can be downloaded from their website Ross-Tech: VCDS-Lite: Download

    As for cable, this or similar from another seller is what you want:
    VAG Group USB com Port OBD2 II KKL ECU Diagnostic Cable Lead Work VCDS Lite 409 | eBay
    downloads and cable bought but it doesnt seem to work properly... maybe a dodgy cheap cable. il have to check it out haha

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    Iirc, works best with xp. Cable that is, install driver for cable first .

    Install vcds lite reboot connect cable and start vcds.

    Check ur com ports on the computer(Google if not sure) I think vcds needs cable to be on com ports 1, 2 or 3

    Cheers mark
    S3 2003........REVO..........Stage 1...........218G/S.......÷..........°8..........=..........272bhp ......368Nm.....271 ft lbs

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    Quote Originally Posted by epox View Post
    Iirc, works best with xp. Cable that is, install driver for cable first .

    Install vcds lite reboot connect cable and start vcds.

    Check ur com ports on the computer(Google if not sure) I think vcds needs cable to be on com ports 1, 2 or 3

    Cheers mark
    hey buddy! iv plugged the cable into my laptop and the driver has installed fine. im using windows 7 could that be the issue?
    and i tried using port 3, maybe il try the other 2 ports i have too. see how it goes!

    thanks

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    I would try xp if you can, on w7 check the cable is on com 1,2 or 3 again do a Google on how to change com ports, long time since I had to do it.

    Almost sure the cable drivers supplied with these cables are for xp-
    .did you let w7 install the driver automatically or from disc.. always use the disc supplied.



    Cheers mark

    http://www.google.com/url?sa=t&rct=j...r5YBbcitLnt7jg
    S3 2003........REVO..........Stage 1...........218G/S.......÷..........°8..........=..........272bhp ......368Nm.....271 ft lbs

 

 

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