Mazda 3 Oxygen Sensor Replacement at your home or office.

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Oxygen Sensor Replacement Estimate for Mazda 3

Mazda 3 Oxygen Sensor Replacement costs $219 on average. Following is a breakdown of the labor and parts estimates.

YourMechanic Price
$161 to $309
Labor: $70 -$80
Parts: $91 -$229
Average Dealer price
$278 to 553
Average Shop price
$200 to 372
Get an instant quote for your car
Our mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
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CarServiceEstimateShop/Dealer Price
2014 Mazda 3L4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$394.96Shop/Dealer Price$490.38 - $744.74
2006 Mazda 3L4-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$314.58Shop/Dealer Price$385.95 - $571.42
2016 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$300.34Shop/Dealer Price$369.36 - $545.06
2015 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$251.96Shop/Dealer Price$313.37 - $461.78
2008 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$304.58Shop/Dealer Price$376.24 - $561.94
2016 Mazda 3L4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$527.02Shop/Dealer Price$652.36 - $1003.44
2012 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$277.96Shop/Dealer Price$343.55 - $509.73
2017 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$290.34Shop/Dealer Price$358.02 - $532.72
Show example Mazda 3 Oxygen Sensor Replacement prices

Service

What is the Oxygen Sensor all about?

With each new model year, manufacturers are adding more oxygen sensors to better manage engine operation. Some high performance engines have an oxygen sensor for each cylinder as well as one for the rear of each catalytic convertor. The sensors are located either underneath the hood or underneath the car. The oxygen sensors are connected (screwed) to the exhaust pipe, either in front or back of the catalytic converter. The front (upstream) sensors measure the amount of oxygen in the exhaust system. The purpose of the front oxygen sensor(s) is to measure how rich or lean the gases are as the gases exit the combustion chamber. Depending upon whether the exhaust gas is lean (high in oxygen content) or rich (low in oxygen content), the amount of fuel entering the engine is adjusted by the engine management computer to try and maintain an ideal mixture that produces the lowest emissions output from the catalytic convertor.

Rear (downstream) sensors are located behind the catalytic converter. The purpose of the rear oxygen sensor(s) is to monitor the oxygen content of the exhaust gases leaving the catalytic convertor.

If one or more of the oxygen sensors are faulty, your car may not pass the emissions test. If you drive your car with a faulty oxygen sensor, you may get poor gas mileage and it can damage the catalytic converter.

Oxygen Sensor-MATROX-1

When replacing the oxygen sensor remember:

  • Many oxygen sensors are damaged by leaking oil or coolant. If that is the case, the cause of that leak needs to be identified and repaired, or else the replacement oxygen sensor will be damaged as well.
  • New vehicles require specific oxygen sensors, and not the universal sensors that were common prior to 1996.

How it's done:

  • Scan the computer in the car for codes.
  • Inspect for vacuum leaks and holes in the exhaust system.
  • Remove and replace the oxygen sensor if it is bad.
  • Check electrical connections.
  • Check for proper operation of oxygen sensors.
  • Clear diagnostic codes.
  • Test drive car.

Our recommendation:

Keep up with the tune-ups. If check engine light is on, don't drive the car too long without getting it inspected. If check engine light is flashing, pull over and get the car towed to avoid costly repairs. Ask the mechanic to inspect the vacuum hoses and leaks in the exhaust system. If the vacuum hose or exhaust system is leaking, it will display an oxygen sensor fault code. Replacing an oxygen sensor may not fix the problem.

What common symptoms indicate you may need to replace the Oxygen Sensor?

  • Check Engine light is on.
  • Car is getting poor gas mileage.
  • Emission test fails.

How important is replacing the oxygen sensor?

Your vehicle has multiple oxygen sensors, and they all help the car run optimally. The front sensors measure how much oxygen is in the exhaust stream to measure how rich or lean the gases leaving the gas chamber are. The rear sensors measure the oxygen content of the gases as they leave the catalytic converter. The oxygen sensors then relay this information to your vehicle’s electronic control unit, so that it can adjust as necessary. Because cars depend on an ideal fuel-to-air ratio to function optimally, the oxygen sensors are leaned on for engine performance. When your oxygen sensors fail your car will run less smoothly, get worse mileage, and have worse emissions.

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Excellent Rating


YourMechanic Mazda 3 Oxygen Sensor Replacement Service

Average Rating

4.4/5

Number of Reviews

7

Rating Summary
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Meet some of our expert Mazda mechanics

Real customer reviews from Mazda owners like you.

Ira

33 years of experience
216 reviews
Ira
33 years of experience
Incredibly personal. Went the extra mile to make sure everything was all set with my car. Convinced that he did a better job than any shop I could have went to. Ira will be my go-to for any future car work I may need.
2011 MAZDA 3 - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM) - TAMPA, FLORIDA

Lucas

14 years of experience
707 reviews
Lucas
14 years of experience
The mechanics themselves are great. But the Your Mechanic business side of things wasn't at their level. The initial diagnostic said I should replace an O2 sensor. I scheduled the appointment to have it replaced. Two days prior to the appointment, 'your mechanic' called and said the initial quote was wrong and that I needed a different O2 sensor which was more expensive. I OKed the different part and when the mechanic showed up, it turned out to be the wrong part for the car and the mechanic said I needed the sensor which was originally recommended. This caused a completely unnecessary delay and multiple appointments which didn't need to happen. I asked the customer service rep why they changed the part recommendation in the first place, and he didn't really have an answer for me. I can't help but think it was an attempt to up-sell me. They did compensate my trouble by throwing in a belt replacement for free and said they gave me another discount as well. So I appreciate that. But in terms of trust and reliability of the business, I'm going to have a hard time vouching for this service as the convenience factor was clearly compromised.
2007 MAZDA 3 - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM) - LOS ANGELES, CALIFORNIA

Joel

18 years of experience
501 reviews
Joel
18 years of experience
Great guy, troubleshot an ongoing issue and figured it out. On time and professional.
2007 MAZDA 3 - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM) - JACKSONVILLE, FLORIDA

Chris

13 years of experience
389 reviews
Chris
13 years of experience
Fast and easy, helped me learn some stuff too!
2004 MAZDA 3 - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM, REAR/LOWER/DOWNSTREAM) - SAN FRANCISCO, CALIFORNIA
Get an instant quote for your car
Our mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
Get a quote
CarServiceEstimateShop/Dealer Price
2014 Mazda 3L4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$394.96Shop/Dealer Price$490.38 - $744.74
2006 Mazda 3L4-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$314.58Shop/Dealer Price$385.95 - $571.42
2016 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$300.34Shop/Dealer Price$369.36 - $545.06
2015 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$251.96Shop/Dealer Price$313.37 - $461.78
2008 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$304.58Shop/Dealer Price$376.24 - $561.94
2016 Mazda 3L4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$527.02Shop/Dealer Price$652.36 - $1003.44
2012 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$277.96Shop/Dealer Price$343.55 - $509.73
2017 Mazda 3L4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$290.34Shop/Dealer Price$358.02 - $532.72
Show example Mazda 3 Oxygen Sensor Replacement prices

How can we help?

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1-800-701-6230 · hi@yourmechanic.com