1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

O2 sensor part number

Discussion in '1st Gen Tundras (2000-2006)' started by CC80guy, May 8, 2025.

  1. May 8, 2025 at 8:19 AM
    #1
    CC80guy

    CC80guy [OP] New Member

    Joined:
    May 21, 2024
    Member:
    #117218
    Messages:
    198
    Gender:
    Male
    First Name:
    Larry
    Lehighton, PA
    Vehicle:
    2001 Tundra SR5 Access Cab TRD 4.7
    Bank 1 sensor 2, 2001, 4.7 V8, 4WD, AC cab, Denso part number?
     
  2. May 8, 2025 at 8:23 AM
    #2
    shifty`

    shifty` In South Dakota Trouble ain't hard to find

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    28,683
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    www.densoautoparts.com is your source. Bookmark it, great, easy to use part finder.

    Upstream is universal. 4WD downstream are different than 2WD. Here are the 'Direct Fit' (i.e. non-universal) part numbers. I recommend replacing in pairs, but ... you do you. Note, I believe the downstream use a basic gasket, and I don't know if the Denso part will come with it.

    upload_2025-5-8_11-23-17.png
     
  3. May 8, 2025 at 8:35 AM
    #3
    CC80guy

    CC80guy [OP] New Member

    Joined:
    May 21, 2024
    Member:
    #117218
    Messages:
    198
    Gender:
    Male
    First Name:
    Larry
    Lehighton, PA
    Vehicle:
    2001 Tundra SR5 Access Cab TRD 4.7
    Thanks, much appreciated.
     
  4. May 12, 2025 at 10:09 AM
    #4
    CC80guy

    CC80guy [OP] New Member

    Joined:
    May 21, 2024
    Member:
    #117218
    Messages:
    198
    Gender:
    Male
    First Name:
    Larry
    Lehighton, PA
    Vehicle:
    2001 Tundra SR5 Access Cab TRD 4.7
    Soooooo, the Denso sensor arrived Saturday and this morning I gathered all the tools I thought I might need, laid my cardboard under the truck, flopped on the ground, crawled under the truck, turned on the shoplight and behold,,,,,,,,,,,,,,, a friggin mess!!! Wouldn't ya just love to beat on some nimrods with a 2x4!?

    Bank 1 sensor 2.jpg
     
    KNABORES likes this.
  5. May 12, 2025 at 10:45 AM
    #5
    shifty`

    shifty` In South Dakota Trouble ain't hard to find

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    28,683
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    Obviously the person who did that didn't have any nuts. Double entendre intentional.
     
  6. May 12, 2025 at 10:51 AM
    #6
    Kalannar97

    Kalannar97 New Member

    Joined:
    Feb 13, 2024
    Member:
    #111912
    Messages:
    95
    Gender:
    Male
    First Name:
    Michael
    Tullahoma, TN
    Vehicle:
    2003 Red Tundra SR5 2wd Access Cab V-8 Auto LSD Rear Axle
    New Frame (Recall in 2019), added 17" 4-Runner Snowflake Rims
    Looks like what I need done to both of my downstream O2 sensors. But that is an awful weld job. Pretty sure I could do a better job and I don't know how to weld.
     
  7. May 12, 2025 at 12:54 PM
    #7
    CC80guy

    CC80guy [OP] New Member

    Joined:
    May 21, 2024
    Member:
    #117218
    Messages:
    198
    Gender:
    Male
    First Name:
    Larry
    Lehighton, PA
    Vehicle:
    2001 Tundra SR5 Access Cab TRD 4.7
    The bugger has a hex nut so I'm assuming (I know, I know) that it unscrews. IF it does unscrew, any educated guess as to what might fit? The upstream sensor?
     
  8. May 13, 2025 at 5:09 AM
    #8
    Kalannar97

    Kalannar97 New Member

    Joined:
    Feb 13, 2024
    Member:
    #111912
    Messages:
    95
    Gender:
    Male
    First Name:
    Michael
    Tullahoma, TN
    Vehicle:
    2003 Red Tundra SR5 2wd Access Cab V-8 Auto LSD Rear Axle
    New Frame (Recall in 2019), added 17" 4-Runner Snowflake Rims
    There are O2 Sensor sockets that you can get. There are two types, one is a socket that is slotted for the wire and the other is a open end wrench that attaches to your breaker bar. Not sure what size it is off hand.
     
  9. May 13, 2025 at 5:12 AM
    #9
    CC80guy

    CC80guy [OP] New Member

    Joined:
    May 21, 2024
    Member:
    #117218
    Messages:
    198
    Gender:
    Male
    First Name:
    Larry
    Lehighton, PA
    Vehicle:
    2001 Tundra SR5 Access Cab TRD 4.7
    Probably wasn't clear enough. I wasn't asking what wrench fits (I have em all) but what sensor might fit.
     
  10. May 13, 2025 at 5:19 AM
    #10
    shifty`

    shifty` In South Dakota Trouble ain't hard to find

    Joined:
    Jun 20, 2020
    Member:
    #48239
    Messages:
    28,683
    ATL
    Vehicle:
    '06 AC Limited V8/4WD
    (see signature for truck info)
    I'd pop that sensor out, grind the weld boogers off, and get back to the original OEM bung plate. I clearly see the studs are still there. You may need to clean the threads and get a new sensor gasket, but it'd take you back to stock.
     
  11. May 13, 2025 at 5:21 AM
    #11
    Kalannar97

    Kalannar97 New Member

    Joined:
    Feb 13, 2024
    Member:
    #111912
    Messages:
    95
    Gender:
    Male
    First Name:
    Michael
    Tullahoma, TN
    Vehicle:
    2003 Red Tundra SR5 2wd Access Cab V-8 Auto LSD Rear Axle
    New Frame (Recall in 2019), added 17" 4-Runner Snowflake Rims
    My bad. It looks like the upstream sensor listed above in @shifty` post listing the different O2 sensors. Is this picture of the one on the pipe off the manifold?
     
  12. May 13, 2025 at 6:32 AM
    #12
    BubbaW

    BubbaW Blessed 2 B above Ground

    Joined:
    Aug 19, 2019
    Member:
    #34845
    Messages:
    3,806
    First Name:
    Bubba
    Where Eagles Nest
    Vehicle:
    04 DC LTD 4X4 4.7 V8
    T150 Lover
    If it’s the 22mm/7/8 in. hex nut you’re asking about, those are upstream, like big hex nut in pic below.The downstream are held in place normally with 2 nuts threaded on exhaust bolts. Appears a previous owner used upstream on downstream if I’m understanding correctly :crazy:

    IMG_6079.jpg
     
  13. May 13, 2025 at 6:56 AM
    #13
    CC80guy

    CC80guy [OP] New Member

    Joined:
    May 21, 2024
    Member:
    #117218
    Messages:
    198
    Gender:
    Male
    First Name:
    Larry
    Lehighton, PA
    Vehicle:
    2001 Tundra SR5 Access Cab TRD 4.7
    Optical illusion, there are no studs. What you probably see are weld boogers. Am I correct that the upstream and downstream plugs are different?
     
  14. May 13, 2025 at 7:32 AM
    #14
    BubbaW

    BubbaW Blessed 2 B above Ground

    Joined:
    Aug 19, 2019
    Member:
    #34845
    Messages:
    3,806
    First Name:
    Bubba
    Where Eagles Nest
    Vehicle:
    04 DC LTD 4X4 4.7 V8
    T150 Lover
    As I mentioned in the post just above yours, the upstream has a 22mm hex bolt like the one your showing and a downstream has 2 bolts welded in the exhaust where 2 nuts hold it on....picture was attached of upstream/downstream for your 2001.
     
  15. May 13, 2025 at 7:32 AM
    #15
    CC80guy

    CC80guy [OP] New Member

    Joined:
    May 21, 2024
    Member:
    #117218
    Messages:
    198
    Gender:
    Male
    First Name:
    Larry
    Lehighton, PA
    Vehicle:
    2001 Tundra SR5 Access Cab TRD 4.7
    Here the bugger is; threaded like the upstream but with a plug like the downstream. And no numbers or codes of any kind stamped on it.

    Old sensor-1.jpg
    Old sensor-2.jpg
     
  16. May 13, 2025 at 7:34 AM
    #16
    BubbaW

    BubbaW Blessed 2 B above Ground

    Joined:
    Aug 19, 2019
    Member:
    #34845
    Messages:
    3,806
    First Name:
    Bubba
    Where Eagles Nest
    Vehicle:
    04 DC LTD 4X4 4.7 V8
    T150 Lover
    Is there a part number anywhere on that sensor ?
     
  17. May 13, 2025 at 7:51 AM
    #17
    CC80guy

    CC80guy [OP] New Member

    Joined:
    May 21, 2024
    Member:
    #117218
    Messages:
    198
    Gender:
    Male
    First Name:
    Larry
    Lehighton, PA
    Vehicle:
    2001 Tundra SR5 Access Cab TRD 4.7
    See above.

    I found a match, Denso 234-4622. Since I'm too close to my inspection date I'm going to give it a shot and order one.
     
    BubbaW[QUOTED] likes this.
  18. May 14, 2025 at 9:40 AM
    #18
    CC80guy

    CC80guy [OP] New Member

    Joined:
    May 21, 2024
    Member:
    #117218
    Messages:
    198
    Gender:
    Male
    First Name:
    Larry
    Lehighton, PA
    Vehicle:
    2001 Tundra SR5 Access Cab TRD 4.7
    I installed the new one today and reset the code so time will tell.
     

Products Discussed in

To Top