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Catalytic Converter?

  • 16-07-2012 3:38pm
    #1
    KaiserLu
    Registered Users, Registered Users 2 Posts: 121 ✭✭


    Hi,

    My Polo just failed the NCT on emissions. It was .04 when it should be .02 apparently! Does this mean a new cat or what are the options?

    Cheers


Comments

  • #2
    andrew_ireland
    Registered Users, Registered Users 2 Posts: 156 ✭✭andrew_ireland


    I'm guessing that's CO levels yeah? My BMW failed lastweek on emmissions, the CO levels were 0.56% when they should have been less than 0.3%. Passed this morning with 0.01% CO.
    All I did was change the air-filter, fill the tank and added 500ml of Dipetane before driving (a lot) between tests.
    Maybe give that a go, certainly worked for me :)


  • #3
    biko
    Registered Users, Registered Users 2 Posts: 81,220 ✭✭✭✭biko


    It could be a number of things, and maybe something simple like a service and some Dipetane could fix it
    Can you post all numbers from the NCT sheet? Just so we know what number we are talking about here.


  • #4
    KaiserLu
    Registered Users, Registered Users 2 Posts: 121 ✭✭KaiserLu


    High Idle CO 0.40 vol % which is above the 0.20% limit. The low idle was grand.


  • #5
    biko
    Registered Users, Registered Users 2 Posts: 81,220 ✭✭✭✭biko


    CO Failure is the result of an excessively rich air fuel mixture. The following is a list of the most common causes:
    - Defective Oxygen Sensor
    - Inoperative Air Injection System (if equipped)
    - Leaking or defective Fuel Injectors
    - Restricted air filter (especially if high CO is present only at high RPM)
    - Vacuum leaks resulting in improper MAP sensor operation
    - Defective air mass or air flow sensor
    - Malfunctioning fuel evaporation system or purge valve
    - Defective Catalytic Converter
    - Defective thermostat (cooling system), thermostat stuck open
    - Oil contaminated with fuel, excessive miles between oil changes
    I'd start with new air filter and have an exhaust centre look for leaks and the sensor.


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