How to Replace an Oxygen Sensor | YourMechanic Advice

How to Replace an Oxygen Sensor

Schedule Oxygen Sensor Replacement
Service Area

$108.80 - $839.64

Price range for all vehicles
Average rating from 1,227 customers who received a Oxygen Sensor Replacement.

Oxygen sensors are one of the most important components on a modern vehicle’s engine management system. They are responsible for monitoring the air fuel mixture of the engine, and their readings affect important engine functions such as timing and air fuel mixture.

Over time, with normal use, oxygen sensors can begin to function with a delayed response, and they will eventually fail. Typical symptoms of a failed oxygen sensor are decreased engine performance, decreased fuel efficiency, rough idle, and in certain cases, even misfires. Usually a failed oxygen sensor will also set off a check engine light, specifying which sensor on what bank has failed.

In most cases, replacing an oxygen sensor is a relatively straightforward procedure that usually only requires a few tools. In this step by step guide, we will go over what removing and replacing an oxygen sensor typically entails.

Part 1 of 1: Replacing an oxygen sensor

Materials Needed

scanning tool

Step 1: Identify the faulty sensor. Before beginning, connect the OBD II scan tool to the vehicle and read the codes to determine which specific oxygen sensor has failed and needs to be replaced.

Depending on the engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the engine. Reading the trouble codes will tell you exactly which sensor is in need of replacing — either the upstream (top) or downstream (bottom) sensor — and on what bank (side) of the engine.

vehicle raised on jack stands

Step 2: Raise the vehicle. Once the faulty sensor has been identified, raise the vehicle and secure it on jack stands. Be sure to raise the vehicle on the side which you will allow you to access the oxygen sensor that needs to be replaced.

person disconnecting the oxygen sensor

Step 3: Disconnect the oxygen sensor connector. With the vehicle raised, locate the faulty oxygen sensor and disconnect the wiring harness connector.

person using tools to remove the oxygen sensor

Step 4: Remove the oxygen sensor. Using the oxygen sensor socket or the appropriate size open end wrench, loosen and remove the oxygen sensor.

side by side comparison of the oxygen sensor

Step 5: Compare the faulty oxygen sensor with the replacement sensor. Compare your old oxygen sensor with your new replacement to ensure the correct fitment.

new oxygen sensor installed

Step 6: Install the new oxygen sensor. Once fitment has been verified, install your new oxygen sensor, and connect the harness.

person using a scan tool to erase the trouble codes

Step 7: Clear the codes. Once the new sensor has been installed, it is time to clear the codes. Connect the OBD II scan tool to the vehicle and clear the codes.

person inserting and turning key in the ignition

Step 8: Start the vehicle. Once the codes have been cleared, remove and reinsert the key, and then start the vehicle. The check engine light should now be gone, and the symptoms you were experiencing should be alleviated.

In most vehicles, replacing an oxygen sensor is a simple procedure that requires only a few tools. However, if this is not a task you are comfortable doing on your own, this is something that any professional technician, such as one from YourMechanic, can take care of quickly and easily.


Next Step

Schedule Oxygen Sensor Replacement

The most popular service booked by readers of this article is Oxygen Sensor Replacement. Yourmechanic’s technicians bring the dealership to you by performing this job at your home or office 7 days a week between 7AM-9PM. We currently cover over 10k cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Recent Oxygen Sensor Replacement reviews

Excellent Rating


YourMechanic Oxygen Sensor Replacement Service

Average Rating

4.9/5

Number of Reviews

1,227

Rating Summary
1,155
42
7
7
16
1,155
42
7
7
16

Michael

15 years of experience
554 reviews
Michael
15 years of experience
Lexus LS430 - Oxygen Sensor Replacement (Front/Upper/Upstream) - Marietta, Georgia
Michael has a very pleasant attitude and is an excellent mechanic who really knows his stuff. My vehicle is as good as new since he repaired it. I am thoroughly impressed and highly recommend his services.
Toyota Solara - Oxygen Sensor Replacement (Front/Upper/Upstream) - Atlanta, Georgia
Just had the best appointment with Michael for a strut mount and O2 sensor replacement. He is super friendly, efficient, and knowledgeable. Felt really great leaving my old car in his hands! Definitely recommend him.

Luis

21 years of experience
75 reviews
Luis
21 years of experience
Nissan Sentra - Oxygen Sensor Replacement (Front/Upper/Upstream, Rear/Lower/Downstream) - Pflugerville, Texas
Luis did a great job and he was informative! I would like him to work on my car again the next time I need services. He is professional and did awesome - he gets 5+ stars  from me!
Honda Element - Oxygen Sensor Replacement (Rear/Lower/Downstream) - Cedar Park, Texas
He showed up on time! Went to work, got her done in record time, and here we are...happy and content. Thank you Luis. I will ask for you by name next time. Thanks.

Ralph

37 years of experience
134 reviews
Ralph
37 years of experience
Toyota Corolla - Oxygen Sensor Replacement (Rear/Lower/Downstream) - Bonney Lake, Washington
Got here within the window. Completed within the time window. Check engine light is gone and the sensor is replaced.

Jason

14 years of experience
130 reviews
Jason
14 years of experience
Honda Accord - Oxygen Sensor Replacement (Front/Upper/Upstream, Rear/Lower/Downstream) - Cambria Heights, New York
Jason was Friendly and professional , let me know about other services I should do on the car.. very helpful. Would definitely use him again & recommend him to anyone.

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE