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Estimates Exhaust and Emissions Rear Oxygen Sensor Replacement

Toyota Highlander Rear Oxygen Sensor Replacement

An oxygen sensor replacement is usually a pretty straightforward and affordable task. We stress the term usually because replacement cost can vary, depending on what type of car you have.

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Average Shop Price $428
RepairSmith Price $243
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This range covers an average Rear Oxygen Sensor replacement. Tell us your car to get a guaranteed price from RepairSmith.

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Toyota Highlander Rear Oxygen Sensor Replacement

RepairSmith offers upfront and competitive pricing. The average cost for Toyota Highlander Rear Oxygen Sensor Replacement is $396. Drop it off at our shop and pick it up a few hours later, or save time and have our Delivery mechanics come to you.

Car
Location
Quoted on
Price
2007 Toyota Highlander
3.3L V6 Base • 281,966 miles
San Francisco CA 94115
Oct 8, 2020
$570 - $696
2001 Toyota Highlander
2.4L L4 • 157,000 miles
Lakewood CA 90713
Jun 29, 2020
$302 - $369
2002 Toyota Highlander
3.0L V6 • 180,000 miles
Garden Grove CA 92841
Jun 4, 2020
$302 - $369
2004 Toyota Highlander
3.3L V6 • 210,000 miles
Rialto CA 92376
Mar 17, 2020
$260 - $318
2004 Toyota Highlander
2.4L L4 • 200,000 miles
San Dimas CA 91773
Feb 10, 2020
$301 - $367
2004 Toyota Highlander
2.4L L4 • 120,000 miles
San Francisco CA 94116
Jan 13, 2020
$306 - $374
2002 Toyota Highlander
3.0L V6 Limited • 200,000 miles
Stanford CA 94305
Jan 8, 2020
$273 - $333
2004 Toyota Highlander
2.4L L4 • 265,000 miles
Pittsburg CA 94565
Dec 2, 2019
$291 - $355
2006 Toyota Highlander
Base • 151,000 miles
Palos Verdes Peninsula CA 90274
Nov 7, 2019
$347 - $425
2002 Toyota Highlander
Base • 130,000 miles
Alamo CA 94507
Oct 19, 2019
$611 - $747
Last Updated:
Nov 13, 2020 5:47 PM
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What is a Rear Oxygen Sensor?

This might blow your mind but…oxygen sensors (O2s) are sensors that measure oxygen. Yep, the sensors calculate the amount of oxygen in the exhaust stream, then share that information with your car’s main computer. Most modern cars have at least two oxygen sensors: one before the catalytic converter and one after the catalytic converter. In case you were wondering, the catalytic converter, which is located in the exhaust system, is an emissions control device that cleans up the fumes leaving your engine. Anyhow, the front oxygen sensor (also known as an upstream oxygen sensor) is a key input to your car’s computer for fuel control. The computer uses information from the sensor to estimate the engine’s air-fuel mixture. Then, it adjusts fuel delivery accordingly. On the other hand, the rear oxygen sensor (also known as a downstream oxygen sensor) primarily monitors the performance of the catalytic converter. The rear sensor has very little, if any, input regarding fuel control. Oh, and one more thing – most modern oxygen sensors have built-in heaters. When you first start your engine when it’s cold, the heater element gets the sensor nice and toasty. That allows the sensor to get up-to-speed and begin operating more quickly.

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Symptoms of a failing Rear Oxygen Sensor

Check engine light

If your car’s rear oxygen sensor isn’t doing its job, chances are, the computer will notice and turn on the check engine light. The device will also store corresponding diagnostic trouble codes (DTCs) in its brain. Your mechanic can retrieve said codes using an electronic device, called a scan tool.

Failed emissions test

Is it time for your routine emissions test? Well, guess what – you’re not going to pass if the check engine light is on from a bad rear oxygen sensor. You also won’t pass if the rear oxygen sensor is out to lunch and it’s preventing your car’s computer from running its system self-tests.

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How urgent is a Rear Oxygen Sensor Replacement?

The rear oxygen sensor is less of a troublemaker than the front oxygen sensor. For the most part, the rear oxygen sensor just polices the catalytic converter. So, it’s unlikely to leave you stranded and it shouldn’t cause any additional harm to your vehicle.

But it will keep that annoying check engine light illuminated and, really, do you want to look at that thing every day? Plus, a bad rear oxygen sensor can cause you to fail a state emissions test – and nobody wants that.

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