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Mercedes-Benz E250 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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Mercedes-Benz E250 Rear Oxygen Sensor Replacement

RepairSmith offers upfront and competitive pricing. The average cost for Mercedes-Benz E250 Rear Oxygen Sensor Replacement is $326. 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
2016 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec • 59,000 miles
Grass Valley CA 95945
Nov 20, 2020
$299 - $365
2015 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec • 14,000 miles
Thermal CA 92274
Nov 16, 2020
$296 - $362
2016 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec • 62,000 miles
Burbank CA 91510
Nov 4, 2020
$303 - $371
2015 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec 4Matic • 88,000 miles
Fallbrook CA 92028
Nov 2, 2020
$275 - $337
2015 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec • 95,000 miles
Alviso CA 95002
Oct 28, 2020
$304 - $372
2016 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec • 71,000 miles
Las Vegas NV 89169
Oct 24, 2020
$331 - $405
2014 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec • 84,000 miles
San Jose CA 95131
Oct 7, 2020
$279 - $341
2014 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec 4Matic • 62,000 miles
Laguna Beach CA 92651
Oct 4, 2020
$276 - $338
2015 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec 4Matic • 40,000 miles
Oakland CA 94603
Sep 29, 2020
$273 - $333
2014 Mercedes-Benz E250
2.1L L4 Turbo Diesel Bluetec 4Matic • 88,000 miles
Coyote CA 95013
Sep 15, 2020
$296 - $362
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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