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Mazda 6 - ODB readings - Lambda nct fail

  • 11-06-2021 2:18pm
    #1
    PTL
    Registered Users, Registered Users 2 Posts: 253 ✭✭


    Hi all. Have a 2008 mazda 6 that failed the NCT on emissions. Readings were miles off

    Low Idle (700 rpm)
    CO 5.96 Vol%
    HC 271 ppm

    High Idle (3000 rpm)
    Lambda 0.81
    CO 7.17 vol%
    HC 350 ppm


    Mechanic says it COULD just need a new oxygen sensor but for the age of the car and needing new brake pads he was leaning towards me scrapping the car but I love the car and hate to see waste. So wondering if anyone on here would be able to look at these odb readings and tell me if they think oxygen sensor should do the trick and then a bit of cataclean after might get me past the nct.

    First MAF with two revs seems normal
    https://imgur.com/BK7PCMi

    Worried about the cat fail on that but not sure could that be sensor 2?
    https://imgur.com/KmAlkAu

    This is with a warmed up engine and multiple 3000 revs and nothing changes. I think its meant to be close to zero mA on sensor 1? and moving back to zero but this just stays at 6.35mA
    AHTA9Rq

    Here is a list of all the readings at idle
    https://imgur.com/hF6Mn6t

    Then a list of all readings at 2000 RPM
    https://imgur.com/ZLfqArO

    If you need any more readings or info just ask and I'll post them

    Thank you in advance to anyone willing to give their time to reply.


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