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    The sense and nonsense on Emission testers

    This article aims to dispell some of the myths that seem to be around emission testers.

    Article No. 33 Page 1/3

    AVL 4000 PEUGEOT OEM testerclick for AVL 4000 emission tester info
    WoF Testing

    The upcoming WoF regulations with regards to emission testing causes a lot of anxiety amongst garage owners and testing stations.
    What is the main stumbling block? The investment that needs to be done before the returns.
    The investments needed are training, which is invaluable and will always stay with you and the outlay for an emission tester.
    Yet no one hesitates about the need for a similar priced hoist: "with out it we can't do our work"....

    In this article I would like to share with you some of the bits I have 'taken with me' during service training on emission testing equipment form SUN electric, MIAC, Grundig and AVL.
    AECS sells AVL and MIAC emission testers. I am sure you will find it interesting as I have tried to leave out the boring bits plus it might get rid of some of the nonsense and mythology that is around.


    An emission tester can not tell you what is wrong with a vehicle, it can give an indication. Some emission testers come with a great deal of diagnostic support software like the AVL 4000. At the first page in the manual they state that this software is meant to guide you in a direction. Not one emission tester can find for example a voltage loss on a temperature signal wire for you, yet it will affect the emissions.

    Both emission testers for Diesel and petrol are working with light absorbsion, but both work very different and the petrol tester can not be used for Diesel vehicles.

    Diesel vs Petrol

    The Diesel tester works with 'normal' light where the Petrol tester works with infra red (IR) light.
    On the petrol tester an IR light source 'shines' through a tube towards receptors.
    All gases will take different parts of the IR light wave length away. In laymen's terms, the more percentage of a certain gas the lesser the amount of light of the corresponding frequency is received on the other side.

    Petrol tester gas bench and O2 sensor



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