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Thread: When to replace ox sensor?

  1. #1
    Join Date
    Jan 2004
    Location
    Lexington, Kentucky
    Posts
    2,561

    Default When to replace O2 sensor?

    I get conflicting information on this. Some say 100,000 miles, others say change at 60,000. I have also heard the term "lazy sensor" which I think indicates a slow response to fuel /air adjustment needs.

    I have no known problems. However, I am into preventative maintainance and I have almost 60,000 on this sensor.

    BTW, I have heard from my indy to always use an OE Bosch O2 sensor. For some reason they seem to have a lower failure rate than OEM/aftermarket bosch sensor. Not proven.

    TIA
    Last edited by Russell; 07-22-2005 at 09:42 AM.
    Thanks,

    1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment

  2. #2
    Join Date
    May 2004
    Location
    Japan
    Posts
    9,249

    Default

    Well, Bentley repair Manual has the instructions to check the oxy sensors.

    First thing I would do, is to check the looks of the sensor, as it will tell you a lot.
    A mileage where it get's bust is not lcear, depends on conditions. Here is what Walker says


    I just bought oxy sensors from Autohausaz at a good price of $ 63.10 for the 750 and I will install them soon. No problems with the old ones, but I want to check if new ones work better = which I somehow can see/recognize/feel = less fuel consumption etc.
    Maybe waste of money, but here in japan they cost >$ 300/each and I need 2 per car on my 2 750.

  3. #3
    Join Date
    Jan 2004
    Location
    Lexington, Kentucky
    Posts
    2,561

    Default

    may just replace as you suggest-thanks
    Thanks,

    1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment

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