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Estimates Exhaust and Emissions Rear Oxygen Sensor Replacement

Ford Expedition 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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This range covers an average Rear Oxygen Sensor replacement. Tell us your car to get a guaranteed price from RepairSmith.

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Ford Expedition Rear Oxygen Sensor Replacement

RepairSmith offers upfront and competitive pricing. The average cost for Ford Expedition Rear Oxygen Sensor Replacement is $108. 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
Quoted to
Drop-off
Delivery
Price
2001 Ford Expedition 4.6L V8
240,000 miles
Mark C  • 
October 26, 2020 11:58 PM  • 
Sacramento CA 95822
$210
1.30  hrs
1.50  hrs
2003 Ford Expedition 5.4L V8
168,000 miles
Ken B  • 
October 13, 2020 3:24 AM  • 
Phoenix AZ 85053
$91
0.80  hrs
1.00  hrs
2000 Ford Expedition 5.4L V8
119,000 miles
Chico R  • 
July 3, 2020 10:25 PM  • 
Valley Village CA 91607
$112
2.10  hrs
0.80  hrs
2003 Ford Expedition 5.4L V8
223,555 miles
Mon N  • 
June 17, 2020 8:04 AM  • 
Walnut CA 91789
$99
3.90  hrs
0.80  hrs
2005 Ford Expedition 5.4L V8
72,000 miles
Dennis H  • 
May 20, 2020 10:51 PM  • 
Brea CA 92821
$99
3.40  hrs
0.80  hrs
2000 Ford Expedition 5.4L V8
230,000 miles
Anthony C  • 
May 17, 2020 7:02 PM  • 
Hawthorne CA 90250
$112
5.10  hrs
1.00  hrs
2004 Ford Expedition 5.4L V8 XLT
265,647 miles
Adrienne H  • 
April 17, 2020 2:40 PM  • 
Elk Grove CA 95757
$94
1.20  hrs
0.70  hrs
1999 Ford Expedition 4.6L V8
189,000 miles
Frank G  • 
March 4, 2020 1:00 PM  • 
Torrance CA 90504
$106
2.50  hrs
0.80  hrs
2005 Ford Expedition 5.4L V8
100,800 miles
Ramon F  • 
February 29, 2020 9:46 PM  • 
South Gate CA 90280
$97
5.10  hrs
1.00  hrs
2002 Ford Expedition 5.4L V8
220,228 miles
Miguel S  • 
January 30, 2020 2:44 AM  • 
Burlingame CA 94010
$94
2.70  hrs
0.90  hrs
2002 Ford Expedition 5.4L V8
220,228 miles
Miguel S  • 
January 30, 2020 2:43 AM  • 
Burlingame CA 94010
$94
3.60  hrs
0.80  hrs
1997 Ford Expedition 5.4L V8
200,000 miles
Ray H  • 
December 11, 2019 5:00 PM  • 
Rancho Cucamonga CA 91701
$109
4.50  hrs
0.80  hrs
2005 Ford Expedition Eddie Bauer
72,000 miles
Dennis H  • 
November 21, 2019 11:55 PM  • 
Brea CA 92821
$69
1.90  hrs
0.90  hrs
2006 Ford Expedition King Ranch
136,000 miles
Patrick Q  • 
October 15, 2019 8:29 PM  • 
Imperial Beach CA 91932
$117
2.20  hrs
1.00  hrs
2001 Ford Expedition XLT
199,000 miles
Theodis H  • 
August 27, 2019 3:51 PM  • 
Olathe KS 66061
$114
1.30  hrs
0.90  hrs
2003 Ford Expedition Eddie Bauer
200,000 miles
Barry H  • 
July 1, 2019 3:24 AM  • 
Huntington Park CA 90255
$114
2.50  hrs
0.70  hrs
2004 Ford Expedition Eddie Bauer
195,206 miles
David G  • 
June 28, 2019 9:00 AM  • 
Escondido CA 92025
$99
1.10  hrs
0.80  hrs
1997 Ford Expedition 5.4L V8
217,000 miles
Amanda H  • 
 • 
Riverside CA 92503
$101
1.50  hrs
0.90  hrs
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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