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Exhaust emission warning light

Discussion in 'Omega, Monaro VXR, VXR8, Carlton, Senator, Manta & Monza owners forum' started by mocap, Mar 17, 2008.

  1. mocap

    mocap New Member

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    Location:
    Marnhull, Dorset, UK
    Hi all. I have a warning light light on constantly after engine start. The manual says it is the Control indicator for exhaust emission. It's the amber light above the red park brake light. Is this indicating a component failure or is there a sensor monitoring the emissions and indicating this to be below standard ? If this is the case could it be the engine needs servicing (new plugs etc) ?

    The vehicle is a 52 reg 2.2 petrol Omega and has done 60k.

    Many thanks for any help or advise.

    Chris.
  2. DevonGSi

    DevonGSi ITS ALIVE!

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    There is a sensor in the exhaust. Its called a Lamda sensor. I monitors the amount of oxygen in the gasses and alter the mixture accordingly.

    If it is this sesnor your EML light will be on. This the amber light with a picture of an engine it. And a fault code will be logged.

    Not too tricky to replace.
  3. mocap

    mocap New Member

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    Wow.. that was quick..thank you very much. The light is as you descibe with the engine block picture.

    Is this sensor something I can change with standard tools or is specialist stuff required ?
    ( I am able to tackle most jobs but limited when special tools or access etc is required.)

    Are these sensors prone to failure at this sort of age ? and is there still the possibility that the sensor is working and it's telling me my exhaust emissions are too high ?

    Thanks again

    Chris.
  4. DevonGSi

    DevonGSi ITS ALIVE!

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    Standard tools. It like a replaceing a spark plug kinda job.

    Usually in the down pipe part of the exhaust or in the exhaust manifold. Sorry I dont know the 2.2 Omega very well.

    Once you have found it its a matter of unscrewing it from the exhaust. screwing in the new one. Trace the wire of the old one back replacing it with the new. That way you know it is routed properly. There will be a plug at the other end. Unlug...plug in.

    You should read the fault code really. Does the light have a piccy of an engine in it? Not heard of a light just for exhaust emissions.
  5. mocap

    mocap New Member

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    The picture on the light is definatley an engine, and it's from the manual that I got the info about it being the exhaust emissions. It doesn't make reference to any other kinda prob. such as electronics or similar.

    I can't myself read the fault code ... would have to take it to the dealer for this. Is my local garage guy likely to be able to read this code ?

    thanks again.

    Chris
  6. DevonGSi

    DevonGSi ITS ALIVE!

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    On alot of the vauxhalls you can read them yourself. Not sure about your 2.2 but someone on here will know. It involes shorting pins A+B on the EML diagnotics plug. Dont go trying it until you know you can do it. Otherwise its pop to vauxhall and ask nicely if they will read the code with a TECH2 reader.

    The EML (Engine Managent Light) is used to show a problem/fault with lots of sensors in the engine. Lambda sensor being on of them. It may not be this error.

    I would wait until the codes have been read.

    Are you having and running/starting problems?
  7. DevonGSi

    DevonGSi ITS ALIVE!

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  8. mocap

    mocap New Member

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    The manual seems quite clear that this light is for the exhaust emissions only. There is another warning light for the rest of the engine/transmission/electronics and immobiliser.
    Anyway, I did find the sensor that you refer to and pulled it out to have a look. It was caked in black soot, so I cleaned it up on the bench and then replaced it. Did no good though.. light still on ..
    I guess there's no way of telling if this sensor is where the fault lies, so it looks like a trip to have the code read. I looked through the stuff on your link and it did say that you can't do the self reading on cars younger than circa 2000 ..... this may be why the 2.2 engine is not listed.

    Thanks for your help .. I will of course return to let you know what the problem was.

    Cheers
    Chris
  9. bigall

    bigall New Member

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    Paper clip test dont work on facelift omegas it needs to be read by tech2 or similar software - many garages can read the codes but can they interpret them.

    The 2.2 omega has 2 lamba sensors - one between the manifold and small cat and another between small cat and large cat.

    Cleaning lambas doesn't work usually replacement is only way.

    EGR valve also makes warning lamp come on
    You really need someone with tech2 facility and KNOWLEDGE to read your codes and then interpret whats wrong -
  10. Tight Git

    Tight Git Well-Known Member

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    Why is everyone assuming the lambda sensor is faulty?

    Perhaps it's telling the truth! :(

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