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Estimates Exhaust and Emissions Rear Oxygen Sensor Replacement

Hyundai Elantra Coupe 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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Hyundai Elantra Coupe Rear Oxygen Sensor Replacement

RepairSmith offers upfront and competitive pricing. The average cost for Hyundai Elantra Coupe Rear Oxygen Sensor Replacement is $274. 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
2013 Hyundai Elantra Coupe
1.8L L4 SE • 15,000 miles
San Francisco CA 94108
Nov 19, 2020
$247 - $301
2013 Hyundai Elantra Coupe
1.8L L4 GS • 118,000 miles
Santa Ana CA 92706
Nov 17, 2020
$231 - $283
2013 Hyundai Elantra Coupe
1.8L L4 SE • 54,000 miles
Somis CA 93066
Nov 8, 2020
$248 - $304
2014 Hyundai Elantra Coupe
2.0L L4 GS • 50,000 miles
Bloomington CA 92316
Oct 28, 2020
$266 - $326
2013 Hyundai Elantra Coupe
1.8L L4 GS • 43,000 miles
Danville CA 94506
Oct 25, 2020
$261 - $319
2014 Hyundai Elantra Coupe
2.0L L4 GS • 73,000 miles
Los Angeles CA 90049
Oct 16, 2020
$243 - $297
2014 Hyundai Elantra Coupe
2.0L L4 GS • 95,000 miles
Fresno CA 93702
Oct 8, 2020
$239 - $293
2013 Hyundai Elantra Coupe
1.8L L4 GS • 104,000 miles
Chula Vista CA 91914
Oct 7, 2020
$232 - $284
2013 Hyundai Elantra Coupe
1.8L L4 GS • 34,000 miles
Rancho Cucamonga CA 91739
Oct 1, 2020
$240 - $294
2013 Hyundai Elantra Coupe
1.8L L4 SE • 116,000 miles
San Francisco CA 94122
Sep 19, 2020
$257 - $315
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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1-Year | 12,000-Mile Warranty