W203 C220 CDI DPF Issue

Discussion in 'Engine' started by TheMOTman, Mar 16, 2017.

  1. TheMOTman

    TheMOTman New Member

    Messages:
    7
    Joined:
    Jan 13, 2017
    Location:
    Grays Essex
    Car:
    C220 CDI & everything else...
    I am pulling my piggin hair out now... Fault codes (amongst others) 2082-8 B28/8 DPF Sensor Plausibility due to defective hose line.

    This is putting on the MIL and hence limp mode. I replaced the B28/8 DPF sensor with the latest one, checked rubber hoses were fine. Cleaned DPF & Forced Regen - performance improved but still went to limp. I replaced the DPF with a brand new one today - No joy - Goes back to limp mode after 10-15 mins of driving. Fault codes can be cleared and performance is fine but always goes back to limp after a short drive.

    New codes today after fitting new DPF are 2084-2 DPF flow monitoring of air mass. The air mass is too small.

    and 2073-8 Check G3/2 O2 sensor upstream of KAT Plausibility.

    This is the first time I have seen these two latest codes.

    Any pointers would be much appreciated. :wallbash:
     
  2. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    18,808
    Joined:
    Feb 8, 2007
    Location:
    Horndean, Portsmouth, Hampshire, Southsea
    Car:
    C43 AMG with a 55 engine and supercharger, E55 AMG, S500, etc
    Blocked CAT?

    Have you a Star?
     
  3. OP
    OP
    TheMOTman

    TheMOTman New Member

    Messages:
    7
    Joined:
    Jan 13, 2017
    Location:
    Grays Essex
    Car:
    C220 CDI & everything else...
    Thanks for reply. I wondered about a blocked cat although I thought the diagnostics would have pulled a code from it, I have another cat so might change it as well. Pig of a job on these though. I don't use STAR but my diagnostics platform is excellent and covers MB no problems.
     
  4. OP
    OP
    TheMOTman

    TheMOTman New Member

    Messages:
    7
    Joined:
    Jan 13, 2017
    Location:
    Grays Essex
    Car:
    C220 CDI & everything else...
    I am actually discounting the CAT as there is no performance issue when the fault codes are cleared. it goes like a scalded cat for 10 mins at least... if the CAT was blocked the power would be well down regardless. Looks like I will have to backprobe the electrics to see if there is a break in the DPF sensor wiring.
     

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