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Thread: Nissan Micra oxygen sensor failure

  1. #1
    Join Date
    Sep 2009
    Posts
    1

    Default Nissan Micra oxygen sensor failure

    2006 Micra 1200 with 10,000 miles on clock. Have had 3 oxygen sensor failures, one under warranty. Is this a common problem and if so, should serious representation be made to Nissan?

  2. #2
    Join Date
    May 2007
    Posts
    5,240

    Default

    It could be that the oxygen sensors are not actually the fault.

  3. #3
    Join Date
    Jan 2011
    Posts
    15

    Default

    Even with fitting an after market sensor you should still eliminate the fault if indeed it was the sensor, maybe you should either A. change your repair garage or . B. have the catalyst checked on your car. good luck with either, .

  4. #4
    Join Date
    May 2008
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    8,444

    Default

    Yes, have to agree with the above posts. Sounds as though the fault is elsewhere and the computer (ecu) is blaming the oxygen sensors for the fault. The garage must check the sensors in the live data menu to see what is happening.

  5. #5
    Join Date
    Nov 2010
    Posts
    5

    Default Ford Fiesta 1.25 Zetec 02 76000mls:-engine wng light on

    I've got a similar prob.
    Bought car 3ms ago & within a week engine wng light came on.Daignosis-replace Lambda sensors.
    Done but light back on within days.
    Told to run until MOT-see if it passes(due 11/11)
    Decided to gat Ford main agents to check & they say replace Cat @ 460 then run further diagnostic to see if any fault codes(say other probs caused by failed Cat cd be masked at pres).
    Does this seem correct?

    Also looked back at emissions test results from Nov MOT as below:-

    Fast idle PASS

    RPM Not Checked

    CO Max Limit 0.200 Actual 0.166 Pass

    HC 200 135 Pass

    Lambda Min Limit 0.970 1.030 1.010 Pass

    Natural Idle

    CO 0.300 0.00 Pass

    Overall Pass

    I don't understand these figs.Do they indicate a pass but high levels of emissions indicating a problem such as now seen in near future or are they 'normal' for car of this age & mileage?

    Any thoughts wd be appreciated.
    Last edited by stevieg11; 12-02-11 at 14:06.

  6. #6
    Join Date
    May 2008
    Posts
    8,444

    Default

    Hi,
    The engine in your car does suffer catalyst failure especially if it has had a misfire in the past and most do as coils on these fail regularly. The misfire allows neat petrol to touch the catalyst and destroys it. Ford suffer this more than most.
    The readings for the CO and HC are a little high. O.16 CO indicates the catalyst is not performing as a new one and the slightly high HC at 135 also points to this.
    While the car can still pass the MOT emissions test, the engine computer (ECU) will detect the catalyst failing and put on the engine management light. The fault code will be P0420 indicating catalyst failure. This is because of the tight emissions limits that the manufacturer has to adhere to. So you can still drive your car legally as you have the MOT but the warning light will come on. You can have a catalyst fitted at any garage but the cheaper ones don't last at all.
    If you want absolute assurance that the catalyst is failing, get a diagnostic check done. Ensure the garage checks the performance of both oxygen (lambda) sensors in the 'live data' menu on their computer. If the no.2 sensor 'switches' from around 0.2 volts up to 0.7v and back down again every second or so, this is proof the catalyst has failed.
    Forgot to say that you probably did not need to change the oxygen sensors. This was poor diagnostics.
    Last edited by Hometune; 12-02-11 at 14:34.

  7. #7
    Join Date
    Nov 2010
    Posts
    5

    Default

    Many thanks for your confirmation of problem & info on emissions.

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