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Thread: O2 sensors DIY 2001 525i I6

  1. #1
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    O2 sensors DIY 2001 525i I6

    so i changed my O2 sensors(i got 107Kmiles on the car) today. since nobody posted any pictures of where they are located, i thought i'd do that. even if it helps one person - i did not waste my time taking pix.
    i had to buy the removal tool(22mm, $12 from kragen), also i bought an extender.
    on the second picture you can see one of the sensors( the other one is already removed-circle1), i reccomend to do it on a cold car cause its a very tight space and you can easily burn yourself.

    heres a pic of an old and a new sensor.

    i didnt notice any diffrence in power, but now the car idles at lower RPMs and idling itself is more stable.
    good luck.

  2. #2
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    I could be wrong, but I thought our cars had more than 2 sensors(O2)? Maybe some before and after the cat? My car is a 530i though..


    '01 530i Sport(RED)
    '90 Miata(work car)

  3. #3
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    you're right , i only did the pre-cat ones.

  4. #4
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    Easy as pie huh! Nice gloves.

    I have my CEL on, it claims its the bank 2 before cat o2 sensor.

    But I know it's the Air Mass Meter....I should just get one already.
    '02 E39 530i/5sp Topaz Blue/Black Interior - MegaSquirt3x - PTE6262 turbo - E85 fuel - Volk TE37 SL - Custom Porsche Brembo BBK - 600whp @ 22 PSI
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  5. #5
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    Contact jynost a forum supporter. He has great prices and super fast shipping. Great communication too.


    '01 530i Sport(RED)
    '90 Miata(work car)

  6. #6
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    Quote Originally Posted by JackEatsEmoKids View Post
    Easy as pie huh! Nice gloves.

    I have my CEL on, it claims its the bank 2 before cat o2 sensor.

    But I know it's the Air Mass Meter....I should just get one already.
    the gloves are great indeed ,well they were. some bitch stole them from my carand i dont want to pay another $40 at the stealership for them.trying to find cheaper place.
    well your car is modded a lot from what i heard +1 on keeping it mainteined.

  7. #7
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    Quote Originally Posted by JackEatsEmoKids View Post
    Easy as pie huh! Nice gloves.

    I have my CEL on, it claims its the bank 2 before cat o2 sensor.

    But I know it's the Air Mass Meter....I should just get one already.

    Here is a link to MAF sensor for the 3.0L I6: I started a post about this a few weeks ago on this and the other forum. There are 2 sensors left at that price.

    http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=001&sspagename=STRK%3AME SE%3AIT&viewitem=&item=110278692552&rd=1
    2003 530i SP, PP, CWP, Dinan CAI, Dinan Throttle Body, Dinan Stage III Software, Dinan Strut Brace, Dinan Shock Brace, Dinan Camber Plates, Bilstein Sport, Vogtland Springs, Eibach Anti-Roll Kit, OEM M-Pars 18X9J 275/35/18 all around, OEM M-Aerodynamics Kit, Beisan VANOS Seals, Bavarian CDV, Bluetooth Retrofit, Sirius Retrofit, Driver's 4-Way Lumbar Retrofit, Rear Sunshades Retrofit
    BMWCCA Membership # 405708

  8. #8
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    i have the same issue with needing to change my MAF and O2 sensors on my 2001 525i...the link you posted about the MAF on ebay? how does this ocmpare to the part BMW wants to sell me for $350+? will this sensor also work on my car?

  9. #9
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    Quote Originally Posted by wardy24 View Post
    i have the same issue with needing to change my MAF and O2 sensors on my 2001 525i...the link you posted about the MAF on ebay? how does this ocmpare to the part BMW wants to sell me for $350+? will this sensor also work on my car?
    Check out the Hyundai MAF as well for the 525i and 528i... NOT the 530i...
    I think it's around $200.
    Check the Hyundai dealers...

    Jason

  10. #10
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    jack's a bimmer tech so he gets all the deals.
    Quote Originally Posted by volodka1985 View Post
    I have a manual I6 e39 and it's a great car but sometimes when i need to accelerate fast and it doesn't( cause it can't) i just wanna slow down, pull over, open the hood and shoot the poor bastard in it's inline 6 heart....

  11. #11
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    i would rather use a BMW part but if the aftermarket works well....i would use that to save some money. builind a house so every dollar counts rightnow.

    who is jack and how can i get ahold of him?

  12. #12
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    I suggest doing it on a cold car. Yeah the burns suck but stripping those threads because they are too warm sucks worse.

  13. #13
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    jack posted in here. his forum name is JackEatsEmoKids
    Quote Originally Posted by volodka1985 View Post
    I have a manual I6 e39 and it's a great car but sometimes when i need to accelerate fast and it doesn't( cause it can't) i just wanna slow down, pull over, open the hood and shoot the poor bastard in it's inline 6 heart....

  14. #14
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    I have to get this done soon. Just trying to find a good place for the Sensors. Thanks for the pictures.

  15. #15
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    Pix?

    I purchase the Peake Diagnostic tool and it says Precat oxy Sensor Bank1 Aging. I was going to replace but need Pix!!!!!! Help

  16. #16
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    pictures are gone

  17. #17
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    Quote Originally Posted by mdr478 View Post
    I purchase the Peake Diagnostic tool and it says Precat oxy Sensor Bank1 Aging. I was going to replace but need Pix!!!!!! Help
    You just cuddle up with some egg nog, let me research this easy task for you:

    [ame]http://www.youtube.com/watch?v=DmW7mo-yLr8[/ame]

    http://www.google.com/images?hl=en&q...og&sa=N&tab=wi

    http://www.bimmerfest.com/forums/sho...d.php?t=421939

    http://forums.bimmerforums.com/forum....php?t=1098577

    http://www.bimmerfest.com/forums/showthread.php?t=85741


    LOL. But seriously, if you can't locate an 02 sensor, you most likely shouldn't be the one to replace them. There are two pre-catalytic 02 sensors. Very easy to-do. www.eactuning.com for the parts and they'll walk you thorugh it if you need help.
    "I'd smash that (Jennifer Connelly) like a failed coup in sub-Saharan Africa."
    ~Macktheknife in my epic Jennifer Connelly OT Thread

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