W204 C180K engine diagnostic light on

Discussion in 'Engine' started by 190, Jul 27, 2017.

  1. 190

    190 Hardcore MB Enthusiast

    Messages:
    2,185
    Joined:
    Mar 4, 2015
    Location:
    Cheshire
    Car:
    2009 W204 C180K
    The yellow engine warning light came on today approx. 1/2 mile after a cold start. The car drove perfectly for the next 10 miles but the light remains on.

    I've been meaning to buy a scanner anyway but I read somewhere that if it was fleeting fault the light will clear itself after 3 re-starts. Can anyone comment on that.

    I'll do a search first before I ask what scanner to buy.
     
  2. DSM10000

    DSM10000 MB Club Veteran

    Messages:
    5,185
    Joined:
    Jul 12, 2011
    Location:
    Near Salisbury
    Car:
    E32O CDi Sport, MX5 1.8 Sport, RR 4.2 SC
    Depending on what triggered the warning light (and assuming the fault is not still active) the light may extinguish after a number re-starts but surely it is better to know what the fault light is indicating?

    As for a scanner, you may buy a simple Bluetooth OBD scanner for under £5 and use an app such as Torque or buy much more complex scanners for £100 or so.
     
    2 people like this.
  3. OP
    OP
    190

    190 Hardcore MB Enthusiast

    Messages:
    2,185
    Joined:
    Mar 4, 2015
    Location:
    Cheshire
    Car:
    2009 W204 C180K
    I've searched the forum and I think I'm going to go for a ELM 327 blue tooth OBD scanner. I've got as far as realising that "ELM 327" is only a generic title. ELM 327 is actually the name of the chip that these devices contain. As they are so cheap I need to figure out if it's worth buying a genuine device from a reputable source.
     
  4. Stratman

    Stratman Hardcore MB Enthusiast

    Messages:
    4,333
    Joined:
    Jun 15, 2003
    Location:
    Sunbury
    Car:
    W203 C200 CDI '04Estate
    The ELM327 devices, together with the cheaper code readers, will only read the emissions related codes as that is what OBD2 was originally designed for. Vehicle manufacturers spotted the opportunity to add their own diagnostic information using proprietary data streams, to cover things like transmission, heating ventilation and air conditioning, active suspension and so on. This data is usually unique to individual makers and you'll need to spend a good bit more for a manufacturer specific reader.
     
    1 person likes this.
  5. ernie

    ernie Hardcore MB Enthusiast

    Messages:
    392
    Joined:
    Apr 3, 2006
    Location:
    Scotland East
    Car:
    C Class, W205 Sport 2018
    It might be worthwhile checking the running temperature; it should be in the 90s. My 180 triggered the EML due to a faulty thermostat. Apparently this is flagged up because a low engine temperature affects the emissions...at least that was what I was told by my Service Advisor. He was able to tell me accurately from STAR what my actual temperature was; from memory, it was in the high 70s.

    Ernie
     
    1 person likes this.
  6. ktos92

    ktos92 New Member

    Messages:
    23
    Joined:
    Nov 19, 2013
    Car:
    W204 C200 CDI Sport Edition 125 / W215 CL600 Bi-Turbo M275 V12
    I would plug the car to Star Diagnosis :-D just to make sure it is not rout timing chain
     
  7. OP
    OP
    190

    190 Hardcore MB Enthusiast

    Messages:
    2,185
    Joined:
    Mar 4, 2015
    Location:
    Cheshire
    Car:
    2009 W204 C180K
    Well I'm hoping it's not the timing chain at 57,000 but I will go easy on the revs until I find out what the code is. The light came on at 2000 RPM so it wasn't being driven hard.
     
  8. Aletank

    Aletank Hardcore MB Enthusiast

    Messages:
    1,056
    Joined:
    Aug 1, 2002
    Location:
    Liverpool,UK
    Last edited: Jul 28, 2017
    1 person likes this.
  9. KeithJG

    KeithJG Hardcore MB Enthusiast

    Messages:
    576
    Joined:
    Nov 5, 2014
    Location:
    Dover, Kent
    Car:
    C320CDI Sport Estate V6 7g
    Sorry...but that is not true.

    My ELM327 along with the Torque App on my mobile read error codes for my 7g transmission and told me the number BUT it does give the wrong information what the error code is....the number is correct but you have to look that number up on the MB site to get the true problem.

    The error codes explain mainly for petrol so of course the diesel engine although the same code a different problem to what is wrong.

    The error code number is always correct.
     
  10. OP
    OP
    190

    190 Hardcore MB Enthusiast

    Messages:
    2,185
    Joined:
    Mar 4, 2015
    Location:
    Cheshire
    Car:
    2009 W204 C180K
    I have a scanner on order but in the mean time it might be worth looking at this air pipe under the air box. Now you mention it I remember reading about it. If it's only an hours labour it can't be that hard to get to.
     
  11. Aletank

    Aletank Hardcore MB Enthusiast

    Messages:
    1,056
    Joined:
    Aug 1, 2002
    Location:
    Liverpool,UK
  12. OP
    OP
    190

    190 Hardcore MB Enthusiast

    Messages:
    2,185
    Joined:
    Mar 4, 2015
    Location:
    Cheshire
    Car:
    2009 W204 C180K
    Well the light went off this morning on the 3rd cold start. I guess the code will have been stored so it will be interesting to see what it was when the scanner arrives.

    I learnt something along the way that might be of use to others. It's obvious you can't work on a modern MB without male Torx bits and and female Torx sockets so you need to buy a set. To remove the air box you need an E10 female Torx socket. However 99% of Torx socket sets come with the E10 socket that is 3/8 drive and it won't fit because MB restricted the access with a silly plastic guide tube. You must have a 1/4 drive E10 which is not so easy to find. It's probably better to buy individual sockets as 3 sizes - E8 , E10 and E12 seems to cover most things.
     
  13. OP
    OP
    190

    190 Hardcore MB Enthusiast

    Messages:
    2,185
    Joined:
    Mar 4, 2015
    Location:
    Cheshire
    Car:
    2009 W204 C180K
    When the scanner arrived there was only one rather non specific code stored P0100 - Mass Air Flow. That was over a week ago now and the code hasn't come back.

    The very cheap ELM327 bluetooth scanner with Torque App worked fine with an android phone. I'd have left it connected to the OBD port but there must be some small current draw as the thing lights up even with the ignition off.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.