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Nct Emmisions Failure

  • 02-03-2009 10:37am
    #1
    friday1
    Registered Users, Registered Users 2 Posts: 51 ✭✭


    Just had the car pass the nct (irish MOT) today on a retest. Its an 98 Ford mondeo with 127k on the clock. Original Catalytic Converter.

    Was sure it would fail first time because there was a 10" long rust hole at the bottom of the RH rear door. I just isoponed it and didn't paint it. The Nct crowd shook their heads but it was not a fail item which surprised me.

    On the first test I failed for rear anti-roll bar links, worn rubber. Not a problem, got them off ebay for €15 and changed them myself.

    Then also the emmissions, failed:
    at 2850 rpm:
    Lambda .85 pass is between .98 and 1.02
    CO 5.24%!!! pass is less than .30%
    HC 210 ppm above 200 Ppm is a fail.

    So when I checked this out on the net a lot of sites suggested faulty o2 sensor or Cat was gone. I rang around was quoted €85 for a universal sensor from a motor factors and €165 + vat from Ford Dealers. I got one off ebay for €30, it was the correct one for the car (i.e proper connector) not a universal sensor. Like changing a spark plug, really easy.

    So at this point I was debating whether to get the emmissions checked by a garage. I rang around and was given the old "5.24% sounds very high, what sensor did you use? How much did you pay for it? €30,That won't work!"

    Basically they just wanted to sell me a sensor and the guy laughed when I told him it was €30. I would say they make all their money changing these sensors. I read on the net that 70% of all emmissions failures are caused by faulty o2 sensors.

    Some of them wanted €50 to do a emmisions test so i decided I would let the NCT do it for €28.

    So today 2 weeks later the emmissions were :

    at 2850 rpm:
    Lambda .994 pass is between .98 and 1.02
    Co .15% pass is less than .30%
    HC 28 ppm above 200 Ppm is a fail.

    I passed!

    I did use a shot of redex a week and a half ago and changed the air filter, and warmed up up well beforehand both times. Same Cat also that came with the car.


    So it was a bit of a fluke but I saved a few quid doing a DIY job.

    Oh if anyone wants to buy a recently NCT'd 98 Ford Mondeo 127K, let me know...:D


Comments

  • #2
    Darragh29
    Closed Accounts Posts: 7,097 ✭✭✭Darragh29


    Each to their own but I wouldn't fit a 30 Euro lambda sensor. Maybe the problem with the car was not the sensor at all but that it wasn't warm enough when it was tested.


  • #3
    McSpud
    Registered Users, Registered Users 2 Posts: 612 ✭✭✭McSpud


    Guy at work also failed on old Corsa. The only suggestions I had were to get oil & filter changed & ensure car is fully warmed up before the test.


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