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Failed NCT due to emissions

  • 28-06-2019 9:05pm
    #1
    MichaelPolo
    Registered Users, Registered Users 2 Posts: 1 ✭


    My car was put through the NCT today and it failed due to emissions

    Low idle CO 0.19vol% PASS
    HC 17 ppm N/A

    High idle lambda: 0.99 - PASS
    CO 0.53vol% - MAJOR (limit is 0.2%)
    HC 20ppm - PASS

    The mechanic I talked to said that they would start with the catalytic converter but other people I have talked to have said that it could be something completely different that wouldn't be as much as a catalytic converter replacement. Just thought it was a bit extreme to jump straight to the catalytic converter.

    Any thoughts?

    Car is an 05 VW Polo 1.2L.

    Thanks in advance for the help.


Comments

  • #2
    Stoolbend
    Registered Users, Registered Users 2 Posts: 1,286 ✭✭✭Stoolbend


    Get a compression test done first.

    More often than not the valves are damaged and it would have low compression in one or two cylinders.


  • #3
    babi-hrse
    Registered Users, Registered Users 2 Posts: 788 ✭✭✭babi-hrse


    Dipitane?


  • #4
    Lewis_Benson
    Registered Users, Registered Users 2 Posts: 2,301 ✭✭✭Lewis_Benson


    babi-hrse wrote: »
    Dipitane?

    If there is an underlying problem, diptane will not fix it.


  • #5
    porsche boy
    Registered Users, Registered Users 2 Posts: 1,560 ✭✭✭porsche boy


    We're the other people you talked to Mechanics aswell or just mates??
    Stoolbend is right tho, those Polo's burn valves


  • #6
    Liberta Per Gli Ultra
    Registered Users, Registered Users 2 Posts: 261 ✭✭Liberta Per Gli Ultra


    No expert on emissions but the figures you've provided suggest the air-fuel ratio is fine (slightly rich) and you may need a new catalytic converter (carbon monoxide isn't getting oxidized sufficiently). Still, a fault code reader would be handy to check some sensors for the sake of it.


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