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o2 sensor cls 320 cdi

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by ThinkPad, Dec 8, 2012.

  1. ThinkPad

    ThinkPad Senior Member

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    Joined:
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    Location:
    London
    Your Mercedes:
    E W212; C W204
    I have had a current fault showing on the star machine for upstream o2 sensor.

    Some people I have spoken to say that I should change, as it may effect mpg and may be clogging the dpf.

    Other people are telling me that just leave it as it is, if no CEL is on and no adverse performance there is nothing to worry about.

    As the part is £230 I am not sure what to do...any advice?
     
  2. television

    television Always remembered RIP

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    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    I would leave it, these faults can go away as easily as they came, it could also be a slight MAF fault as the 2 work hand in hand
     
  3. OP
    ThinkPad

    ThinkPad Senior Member

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    Your Mercedes:
    E W212; C W204
    Thanks for the reply.

    Local specialist told me that it could be damaging the DPF so this is what was worrying me, as they said this would be a £1,000 fix.

    Although nothing to do with DPF came up on star.

    Any other views?
     
  4. OP
    ThinkPad

    ThinkPad Senior Member

    Messages:
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    Joined:
    Apr 16, 2012
    Location:
    London
    Your Mercedes:
    E W212; C W204
    Think I have decided to leave as is. If a CEL comes on then I will worry about it.

    Although in the back of my mind, I am still thinking could I be achieving better economy!? Have read a few threads, and opinions are very much split.

    Thanks Television.
     

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