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BMW X3 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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BMW X3 Rear Oxygen Sensor Replacement

RepairSmith offers upfront and competitive pricing. The average cost for BMW X3 Rear Oxygen Sensor Replacement is $287. 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
2012 BMW X3
3.0L L6 Turbo xDrive35i • 75,000 miles
San Francisco CA 94127
Nov 22, 2020
$276 - $338
2016 BMW X3
2.0L L4 Turbo sDrive28i • 34,000 miles
Fontana CA 92337
Nov 15, 2020
$243 - $297
2019 BMW X3
3.0L L6 Turbo M40i • 17,000 miles
Riverside CA 92513
Nov 8, 2020
$234 - $286
2015 BMW X3
2.0L L4 Turbo sDrive28i • 87,000 miles
Duarte CA 91008
Oct 30, 2020
$273 - $333
2018 BMW X3
2.0L L4 Turbo xDrive30i • 21,000 miles
Sutter Creek CA 95685
Oct 27, 2020
$266 - $325
2013 BMW X3
2.0L L4 Turbo xDrive28i • 83,000 miles
Santa Barbara CA 93109
Oct 23, 2020
$244 - $298
2017 BMW X3
3.0L L6 Turbo xDrive35i • 59,000 miles
Fresno CA 93723
Oct 14, 2020
$264 - $322
2019 BMW X3
2.0L L4 Turbo xDrive30i • 38,000 miles
Carson CA 90745
Oct 14, 2020
$302 - $370
2014 BMW X3
3.0L L6 Turbo xDrive35i • 46,000 miles
North Hollywood CA 91618
Oct 11, 2020
$226 - $276
2015 BMW X3
2.0L L4 Turbo Diesel xDrive28d • 61,000 miles
Lakeport CA 95453
Oct 8, 2020
$248 - $304
Last Updated:
Dec 17, 2020 6:25 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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