Mass Air Flow Sensor problems

Discussion in 'Engine' started by AMG--BOY, Nov 6, 2016.

  1. AMG--BOY

    AMG--BOY New Member

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    Oct 15, 2016
    Car:
    C43 AMG Audi RS6 C5 TT 3.2 V6
    Does anyone know if there's a fuse for the MAF as have bought 2 brand new ones now and is still coming up with the same fault codes the first one I bought was for £23 off eBay and the one I fitted yesterday was a HAAS one from eurocarparts for about £120 but am still getting codes for MAF or IAT Sensor malfunction and codes for random cylinder misfire??? Please help

    Maybe I need a geniune mercedes MAF or Bosch???

    Codes im still getting:
    P0110
    P0100
    P0301
    P0300
    P0304
     
  2. zipdip

    zipdip Hardcore MB Enthusiast

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    Well at the risk of sounding boring get to your nearest Merc Indy and let them sort the problem,my S320 having been used as a runabout in London was completely full of soot my indy CCC at Colchester sorted it out and the cost was very reasonable .
     
  3. OP
    OP
    AMG--BOY

    AMG--BOY New Member

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    Car:
    C43 AMG Audi RS6 C5 TT 3.2 V6
    Well thanks for the reply shame there's no easy fix atm but am ganna do a bit mor research on google will be going into my indy in the week
     
  4. OP
    OP
    AMG--BOY

    AMG--BOY New Member

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    C43 AMG Audi RS6 C5 TT 3.2 V6
    I recon I'm on to something it seems there's a sensor separate from the MAF sensor somewhere inthe engine bay called IAT Sensor and this is one of the faults im getting so just gotta find where it is
     
  5. mbenz1

    mbenz1 Hardcore MB Enthusiast

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    '05 C220 CDI Avantgarde SE
    Your best bet for MAFs is to buy genuine from MB or Bosch (not sure if Bosch still make them for MB depending on which engine you have) as aftermarket 'cheap' MAFs do not give good results.

    Also make sure you clear the codes after installing the new sensor (s) and then recheck.

    I'm not a fault code expert but if those fault codes relate to a MAF then this is your best bet.

    Alternatively, as mentioned, get it checked by a good indie with STAR.

    Sent from my GT-I9505 using MBClub UK
     
  6. OP
    OP
    AMG--BOY

    AMG--BOY New Member

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    Yeh am having problems finding exactly where the IAT sensor is ??
     
  7. John Jones Jr

    John Jones Jr Hardcore MB Enthusiast

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    The MAF has a built in IAT. MAF's carry out two functions, airflow and air temperature.
     
    1 person likes this.
  8. mbenz1

    mbenz1 Hardcore MB Enthusiast

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    After having had a look at your fault codes again, they seem similar to what appeared on our CLK 320 petrol which had a 'slight' misfire:

    - Misfiring on certain cylinders/random cylinders
    - MAF sensor voltage issue.

    MB suggested to change all HT Leads and then a coil pack test. After getting leads changed, the codes still remained. MB then found out coil pack 4 was faulty. They then only recommended to change coil pack 4 but not MAF sensor. So before we took it into MB again, we changed the MAF ourself for a brand new BOSCH unit and they replaced coil pack 4 and cleared the codes and all was fine.

    I'm confident that if we didn't change the MAF ourselves before, we'd have spent more money at MB.

    Sent from my GT-I9505 using MBClub UK
     
  9. OP
    OP
    AMG--BOY

    AMG--BOY New Member

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    C43 AMG Audi RS6 C5 TT 3.2 V6
    Ahh ok that's what I thought to start with tbh well think I will leave it to the garage from now will update as soon as I get any mor info
     
  10. OP
    OP
    AMG--BOY

    AMG--BOY New Member

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    C43 AMG Audi RS6 C5 TT 3.2 V6
    Am having my indy look at it monday so will know mor then hopefully
     
  11. OP
    OP
    AMG--BOY

    AMG--BOY New Member

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    Car:
    C43 AMG Audi RS6 C5 TT 3.2 V6
    UPDATE:

    My C43 has just come bk from my Indy he's replaced all the coil pack's and she's running like new again happy day's:bannana:
     
  12. Billa4x4

    Billa4x4 New Member

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    I got my maf sensor replaced then had to have the software updated at a merc independant
     
  13. Marilynn

    Marilynn New Member

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    According to me, you should replace it with genuine, but you must concern to authorized Garage of Mercedes
     

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