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    Quick Links: Aftermarket Headlights HELP! Any advice on changing the downstream 02 sensor? OBDII Bluetooth Device for iOS? 1st gen 1st gen ball joints part numbers Instrument cluster light bulbs Has anyone done headlight restoration ?

O2 Sensors don't match

Discussion in '1st Gen. Tacomas (1995-2004)' started by AJColorado, Jan 1, 2017.

  1. Jan 1, 2017 at 4:40 PM
    #1
    AJColorado

    #1
    AJColorado [OP] Member

    Joined:
    Jan 1, 2017
    Member:
    #206254
    Messages:
    10
    Gender:
    Male
    First Name:
    AJ
    Vehicle:
    1999 Tacoma 3.4 4x4 SR5
    Oops, newb... posted in 2nd gen, moved this over to 1st gen.

    I have a 1999 Tacoma (3.4 v6, Manual 4x4 SR5) with the check engine light on, the previous owner had a diagnostic tool and told me it was the downstream O2 sensor. I want to replace both, but when I looked up the part for my truck at Denso, the recommended part doesn't match what I'm seeing under the truck. Maybe I've got the names wrong but would appreciate your thoughts on this.

    Denso says:

    part
    $60 234-4154 Toyota 4WD Truck Downstream Oxygen Sensor with 12.9” 4-Wire Harness
    234-4154 = Downstream
    part
    $62 234-4161 Oxygen Sensor with 15.35” 4-Wire Harness
    234-4161 = Upstream

    The sensor in front of the cat. has the metal flange and two bolts, the one toward the back has no flange and looks more like a spark plug.

    Here are some pics:

    Both Sensors:
    both.jpg


    The rear sensor:
    close.jpg


    The front sensor:
    frontclose.jpg

    Thanks!
     
    Last edited: Jan 2, 2017
    AJColorado, Jan 1, 2017
    #1

Products Discussed in

Denso 234-4154 Toyota 4WD Truck Downstream Oxygen Sensor with 12.9” 4-Wire Harness
$59.44
Denso 234-4161 Oxygen Sensor with 15.35” 4-Wire Harness
$61.10
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