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Estimates Exhaust and Emissions Front Oxygen Sensor Replacement

Mercedes-Benz GL320 Front 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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$90.58 $1010.5

This range covers an average Front Oxygen Sensor replacement per set. Tell us your car to get a guaranteed price from RepairSmith.

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Mercedes-Benz GL320 Front Oxygen Sensor Replacement

RepairSmith offers upfront and competitive pricing. The average cost for Mercedes-Benz GL320 Front Oxygen Sensor Replacement is $375. 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
2009 Mercedes-Benz GL320
3.0L V6 Turbo Diesel Bluetec 4Matic • 174,000 miles
San Francisco CA 94131
Nov 22, 2020
$339 - $415
2009 Mercedes-Benz GL320
3.0L V6 Turbo Diesel Bluetec 4Matic • 17,000 miles
Oakland CA 94619
Nov 12, 2020
$333 - $407
2008 Mercedes-Benz GL320
3.0L V6 Turbo Diesel CDI • 99,000 miles
San Diego CA 92199
Nov 11, 2020
$336 - $410
2008 Mercedes-Benz GL320
3.0L V6 Turbo Diesel CDI • 101,000 miles
Stanford CA 94305
Nov 4, 2020
$301 - $367
2007 Mercedes-Benz GL320
3.0L V6 Turbo Diesel CDI • 190,000 miles
Rosamond CA 93560
Oct 27, 2020
$351 - $429
2007 Mercedes-Benz GL320
3.0L V6 Turbo Diesel CDI • 81,000 miles
Glendale CA 91205
Oct 21, 2020
$356 - $435
2007 Mercedes-Benz GL320
3.0L V6 Turbo Diesel CDI • 23,000 miles
Mountain Center CA 92561
Oct 18, 2020
$338 - $413
2008 Mercedes-Benz GL320
3.0L V6 Turbo Diesel CDI • 96,000 miles
Los Gatos CA 95030
Oct 12, 2020
$338 - $413
2007 Mercedes-Benz GL320
3.0L V6 Turbo Diesel CDI • 152,000 miles
Castroville CA 95012
Sep 28, 2020
$335 - $409
2007 Mercedes-Benz GL320
3.0L V6 Turbo Diesel CDI • 191,000 miles
Spring Valley CA 91978
Sep 18, 2020
$350 - $428
Last Updated:
Dec 17, 2020 6:25 PM
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What is a Front 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 Front Oxygen Sensor

Check engine light

If your car’s 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.

Poor engine performance

The front oxygen sensor is a primary input to your car’s computer for fuel control. And guess what that means? If the sensor is out to lunch, the computer may end up giving your engine too much or too little fuel. As a result, you may experience performance problems, such as rough running, lack of acceleration and stalling.

Reduced fuel economy

As was mentioned, the front oxygen sensor is a key input to your car’s computer for fuel control. As such, it can confuse the computer and cause it to throw the engine’s air-fuel ratio out of whack, killing your gas mileage.

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How urgent is Front Oxygen Sensor Replacement?

Typically, a bad front oxygen sensor won’t leave you stranded. But it can cause your car to run poorly. Although somewhat rare, a faulty oxygen sensor can also damage other components, such as the catalytic converter. And trust us, catalytic converters are expensive. So, you don’t want to be buying a new one.

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