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  • 5 5 out of 5 stars
    (127 customer reviews)

  • Part #: USOS-4000
  • Mfr #: USOS-4000
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1997-2005 Toyota 4Runner Oxygen Sensor - Replacement - Before Catalytic Converter, 4-wire, Minor Modifications, 5.91 in.

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UNIVERSAL TYPE OXYGEN SENSOR, HEATED, 4-WIRE, SOLD INDIVIDUALLY

This REPLACEMENT oxygen sensor is crafted from high quality materials - stainless steel shell, hex nut, shield, Teflon-covered insulated wires, high-temperature rubber internal and external seals, and threaded tube coated with anti-seize compound.

Tested to ensure highest level of quality and reliability; it helps to reduce harmful emissions and extends catalyst life.

Notes: May not be compatible with flanges. May require minor modifications

View Installation Instruction

Replacement brand parts are the most affordable solution for your replacement needs! Replacement specializes in a wide range of OE comparable auto parts including body parts, lighting, electrical, brakes, suspension, intake, exhaust, cooling and heating parts. All Replacement brand items are backed by 1-year, unlimited-mileage warranty.

  • Location: Before Catalytic Converter
  • Type: 4-wire
  • Product Fit: Minor Modifications
  • Quantity Sold: Sold Individually
  • Anticipated Ship Out Time: 1-2 business days
  • Includes: Butt type connectors, without plug
  • Mounting Style: Threaded-in
  • Notes: Designed to fit screw-in type bungs; May not be compatible with flanges
  • Warranty: 1-year, unlimited-mileage warranty
  • Wire Length: 5.91 in.
This product fits the following Toyota 4Runner submodels
  • 1997-2005: All Submodels; All Engines;

Product reviews

Didn t work by Richard, March 30, 2014

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I have a 2001 Toyota Avalon. Got the P155 code for malfunctioning Bank 2 Sensor 1. Found this part. Said that it was an exact upstream replacement. Didn t work on this specific car.


inexpensive option by Matt, February 24, 2014

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O2 sensors are expensive. The cheapest I could find the regular Denso sensor is $150 this one is less than 1/3rd the price. The only issue is that you need to use the old sensors wire harness - which is a common failure point. So check the old wire harness before purchasing this one. Also the sensor comes with crimps which I think would fail over time. The best bet is to solder the wires and use a liquid electrical tape or something similar to keep road grime and dirt out of the wires. If you go through the effort to do it right then I think the sensor will last as long as the regular Denso. Also as a side note this is a Denso sensor so you are getting a quality O2 sensor.


Website says it will fit but... by leonie, February 19, 2014

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While I m sure this would work as a before catalytic converter oxygen sensor in a 2005 Honda Civic EX like the website said it would it is actually completely useless because 2005 Honda Civics don t use before catalytic converter oxygen sensors they use air fuel ratio sensors. I m sure this is a fine product that works wonderfully as a oxygen sensor based on all of the other great reviews here but double check that this is what your car actually needs! It looks similar to a air fuel sensor and it fit in my car but my car couldn t read anything from it.


Excellent part and Excellent Price by Mickey1982, February 3, 2014

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I purchased this part for my 05 Kia Sedona It was remarkably easy to install and works like a charm. I would recommend this part to anyone replacing a bad O2 sensor.


Easy install with simple wiring knowledge by moccina, January 22, 2014

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This universal oxygen sensor is a breeze to install. The connectors needed to splice your wires are included in the kit and the sensor is also pre-coated with an anti-seize compound right out of the box. Also included is an easy to navigate wiring diagram showing every possible color combination for your vehicle application. Great value on this part all in all.


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