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Could Nox sensor replacement damage fuel filter housing?

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Gromit1991, Mar 17, 2020.

  1. Gromit1991

    Gromit1991 New Member

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    Your Mercedes:
    C250 estate S205. 2014 2.1l diesel.
    My C250 diesel S205 went into the dealership recently to have the EWL diagnosed.

    Needed a new battery. I fitted one the day after. Stop/start works again too.

    They also replaced Nox sensor(s) and software updates which was done under a recall. I'd had a previous recall letter about an airbag issue but not about this. From what I've read on here / other sites vehicles are not actually recalled but will be fixed at MB expense. I'm happy though.

    However, I'm then told that I have a coolant leak and the fuel filter housing is cracked. Circa £400 to replace!

    The more I mull this over I've become suspicious. Could the dealership tech have inadvertently damaged the fuel filter casing during the nox sensor work? Or are they not near each other.

    Car is going back in tomorrow as the EWL was back on when I collected last week!

    Thank you.

    Miles
     
  2. John Laidlaw

    John Laidlaw Senior Member

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    Your Mercedes:
    UnMercs BMW i8 Volvo XC90
    Morning Miles and welcome
    Nox sensors are exhaust related to nowhere near your fuel filters, so it’s unlikely that the work has caused this damage
    Never heard of the housings being damaged on here, but that price sounds steep?
     
  3. OP
    Gromit1991

    Gromit1991 New Member

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    Your Mercedes:
    C250 estate S205. 2014 2.1l diesel.
    John, thank you. That answers my question.
    Cheers,
    Miles
     
  4. Uncle Benz

    Uncle Benz Senior Member

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    Your Mercedes:
    Mainly Mercedes
    Fuel filter housings are a common failure on th om651 engine. It’s most likely it’s nothing to do with the other work, but its so common techs will routinely check for it on any they see. Water pumps too. To be honest they are looking out for you, but £400 is a bit steep.
     
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  5. malcolm210

    malcolm210 Senior Member

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    Common problem on the OM651 engine try and get a contribution from MB or use a MB Independent as changing the housing is quite labour intensive
     
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  6. mioba

    mioba Senior Member

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    Location:
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    Your Mercedes:
    W124/1994/E200, W220/2004/S320CDI, W205/2016/C200, W447/2017/3.0 CDI
    As mentioned they are taking care of your car and ultimatey you. MB are very thorough in this as its business for them except when they say brake disks and pads need doing.

    If you are handy then buy the bits that need replacing and DIY. The labour costs will be at least half of the 400.
     
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  7. OP
    Gromit1991

    Gromit1991 New Member

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    Your Mercedes:
    C250 estate S205. 2014 2.1l diesel.
    Thank you everyone for your advice. Car is being worked on so hopefully get it back in the next day or two. Allowing for the present crisis.
     

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