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  1. #1
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    N54 primary O2 sensor failure rate?

    My car runs lean on bank #1 and all 6 injectors, which are subject for replacement according to BMW, will be replaced.

    There is also a possibility the primary O2 sensor for bank 1 has gone south, since this would give the same codes, lean run and misfires on bank 1.

    What it the experience from faulty 02 sensors, is it common or very rare?

    It would be easy for me to replace the O2 sensors if I remove the bottom cover, so perhaps it is best to replace them as a preventive action, IF they are prone to fail, which I don't know... The car has 50 k on the ODO, so it would not be due for sensor replacement in a "normal" vehicle, where they should last at least the double distance or more.

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    I had both my pre cat o2 sensors replaced as I had issues with the car stumbling at cruising speeds and low load. The car would also throw up lamda related DTC from time to time. Changing the sensors sorted the problem out.

    The Bosch replacements were fairly cheap, about £80 each IIRC.
    Alpine White 2008 6MT 335i - Cobb AP - PTF Tuned - RB Turbos - AR DPs - VRSF 3.5" exhaust - Custom FMIC - 380mm BBK F&R - BMS DCI - M3 DCT LSD - Whiteline subframe bushes - M3 Sways and rear arms - M3 wishbones - ER CP - Spec Stage 3+ clutch and steel SMFW - AST 4100 Coilovers - UUC DSSR -UUC Black tranny mounts - TMS Alu diff bushes - Forge DVs - Aquamist HFS-4 meth - Alufelgen CS7s - BMWP V1 Steering Wheel

  3. #3
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    Thanks for great info ! The problems I have are more connected to high load situations.

    I'll wait and check how the car runs with new injectors first so I have a chance to establish the primary fault. Normally it doesn't matter as long as the car is fixed but real knowledge is important in a longer perspective.

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    1 out of 1 members liked this post. Yes Reputation No
    Mikael- Do you mind checking the P/N on your old injectors?

    My injectors are 13 53 7 537 317-10, and according to this Recall Campaign they should be replaced: http://www.google.com/url?sa=t&rct=j...NS5tY0ibq89VYA

    ...but when I checked with my BMW shop (M-bilar i Västerås) they told me that my car wasn't included in this recall...??


    Here's info from the link:

    Injectors with P/N 13 53 7 585 261 04-08 index are not affected by this Service Action and should not be replaced.


    Injectors with PN/index 13 53 7 537 317-xx or 13 53 7 565 138-01 up to 7 565 138-07 must be carefully removed in a sequential order (following REP13 53 310) and marked with the cylinder number.
    GT-R R35 ​coming up...

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    @BT, your injectors are qualified for recall as I see it since XX means any figure from 00 to 99. Perhaps you need to mark them XX instead of 10 to make it easier fro them Click here to enlarge

    If I have understood it correctly, all injectors from defined batches are tested and e.g. only 4 of them replaced if the other 2 passes the test. This is what they told me. This is utterly ridiculous if all injectors are from the same batch. The test, whatever is done and what it is worth... will not simulate real conditions and if a couple have failed in a short period the remaining will almost for sure fail soon as well.

    So, I told them to replace all of them, independent of the test result, and not only the ones that are failed. They didn't have a problem to understand this requirement.

    My injectors are all 13 53 7 565 138-02



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    Thanks!

    To which shop did you leave your car?

    EDIT: Never mind, I got your email now. Scary stuff... Click here to enlarge
    Last edited by Big Tom; 07-11-2012 at 01:05 PM.
    GT-R R35 ​coming up...

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    i dont think 02 failure rate is high. I didnt have a failure until almost 90k miles. never knew it to be a common problem, but yes, injectors are $#@!

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    I'm at 110k km, no problem here. Although if you have INPA, you can check lambda adaptation values and do a system diagnostic test on your lambdas. I havn't done it myself, but I've seen the option and read my adaptations.

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    i also have never had to touch my 02 sensors. but i've had to replace all 6 injectors Click here to enlarge
    Click here to enlarge
    2007 335i Coupe
    Mods: Check the Garage

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    Thanks for great info. I'm happy if I don't need to crawl under the car to replace O2-sensors.

    All injectors will be replaced in 10 days from now. I suspect the reason for 3 failing injectors is caused by E85. Injectors are cheap so I'll continue using E85 as others do w/o problems. The injectors are less than $200 each and easy to replace and calibrate oneself.
    Last edited by R1000K3; 07-14-2012 at 03:09 AM.

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    Were you using pure E85 or were you blending it with premium fuel? If blending, what ratio?
    From all the things I've lost,
    I miss my mind the most!
    Click here to enlarge

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    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
    Were you using pure E85 or were you blending it with premium fuel? If blending, what ratio?
    60/40 Premium/E85

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    I'm about to replace my bank two wideband. I'm still getting cylinder 5 and 6 misfires on high boost at about 6500 rpms in 4th gear. I've already swapped coils, replaced spark plugs, and injectors on those two. Hopefully this will fix it
    Click here to enlarge
    '07 E90 MT Sports Package l FBO l RB Turbos l JB4 G5 with MHD E85 BEF l N20 MAP Sensor l MMP Inlets l Custom Exhaust l BMS Short Shifter l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450

    Best 1/4 ET: 11.4
    Best 1.4 Trap: 127.7

    '08 E60 MT Fully Loaded l JB4 G5 with BB Pump BEF l BMS DCI l 335is Clutch

  14. #14
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    how much meth are you spraying?

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    how much meth are you spraying?
    CM10, 800 ml/minute.

  16. #16
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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    how much meth are you spraying?
    Im running a CM10 and a CM7, 100% VP
    Click here to enlarge
    '07 E90 MT Sports Package l FBO l RB Turbos l JB4 G5 with MHD E85 BEF l N20 MAP Sensor l MMP Inlets l Custom Exhaust l BMS Short Shifter l NLS & 2-Step l MFactory 3.46 LSD l 335is Clutch with MFactory SMFW l Walbro 450

    Best 1/4 ET: 11.4
    Best 1.4 Trap: 127.7

    '08 E60 MT Fully Loaded l JB4 G5 with BB Pump BEF l BMS DCI l 335is Clutch

  17. #17
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by R1000K3 Click here to enlarge
    Thanks for great info. I'm happy if I don't need to crawl under the car to replace O2-sensors.

    All injectors will be replaced in 10 days from now. I suspect the reason for 3 failing injectors is caused by E85. Injectors are cheap so I'll continue using E85 as others do w/o problems. The injectors are less than $200 each and easy to replace and calibrate oneself.
    How do you calibrate them yourself. I didn't think you could even do it with a Bavarian Technic tool.

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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by Blackhawk36 Click here to enlarge
    How do you calibrate them yourself. I didn't think you could even do it with a Bavarian Technic tool.
    See separate INPA-tread by user vasillalov http://www.bimmerboost.com/showthrea...highlight=INPA

  19. #19
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    I got the car back today. Two injectors were failed and all six were replaced as a preventive action. The car runs great now. The car was delivered to the door free of charge by the dealer.

  20. #20
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    awesome man glad she's buttoned up. nothing out of pocket? or are you out of warranty?
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    2007 335i Coupe
    Mods: Check the Garage

  21. #21
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    Faulty injectors are due to free replacement by BMW.

  22. #22
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    good deal... wish I had that option when I did mine Click here to enlarge
    Click here to enlarge
    2007 335i Coupe
    Mods: Check the Garage

  23. #23
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    Even though the car runs OK now unlike before, at a short test drive, I'll replace both front O2 sensors. They show very different values so the primary sensor for bank 1 is almost for sure due to replacement. The N54 engine is a bit special since it works in closed mode at all load situations when warmed up. This will mask a situation where one or several components degrades, until they fail completely.

  24. #24
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    Is there any source in US that ships 335i primary O2 sensors worldwide?

  25. #25
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    Click here to enlarge Originally Posted by R1000K3 Click here to enlarge
    Is there any source in US that ships 335i primary O2 sensors worldwide?
    Can't you just get these at your local dealer?
    Chrome Space Bar Issue: http://www.boostaddict.com/showthrea...338#post738338


    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

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