Mazda 323 Oxygen Sensor Replacement at your home or office.

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Oxygen Sensor Replacement Estimate for Mazda 323

Mazda 323 Oxygen Sensor Replacement costs $178 on average. Following is a breakdown of the labor and parts estimates.

YourMechanic Price
$120 to $277
Labor: $70 -$80
Parts: $50 -$197
Average Dealer price
$194 to 488
Average Shop price
$146 to 330
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
CarServiceYourMechanic PriceShop/Dealer Price
1986 Mazda 323L4-1.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$420.80Shop/Dealer Price$523.02 - $797.01
1994 Mazda 323L4-1.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$185.16Shop/Dealer Price$228.54 - $325.85
1991 Mazda 323L4-1.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$381.96Shop/Dealer Price$474.49 - $719.37
1991 Mazda 323L4-1.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$185.16Shop/Dealer Price$228.51 - $325.81
1993 Mazda 323L4-1.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$381.96Shop/Dealer Price$474.48 - $719.35
1989 Mazda 323L4-1.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$420.80Shop/Dealer Price$523.02 - $797.00
1989 Mazda 323L4-1.6L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$293.16Shop/Dealer Price$363.56 - $541.88
1988 Mazda 323L4-1.6L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$170.76Shop/Dealer Price$210.54 - $297.04
Show example Mazda 323 Oxygen Sensor Replacement prices

Oxygen Sensor Replacement Service & Cost

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

Keep in mind:

  • 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 this service?

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.

Fast and easy Oxygen Sensor Replacement service at your home or office.

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Meet some of our expert Mazda mechanics

Real customer reviews from Mazda owners like you.

543 reviews
Honorio
15 years of experience
Honorio took the job on his day off after the 1st mechanic could not make the scheduled Sunday morning appiontment. He arrived on time and conducted a pre inspection of the car as well as the struts I purchased. He took his time replacing both struts and thorough going the prcess of replacing both front end struts and then drove the car to insure the replacement struts were operating properly. Overall, a very good mechanic which I would happily use again in the future.
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Trung
8 years of experience
Trung Do was very professional. He was very good with communicating before appt with phone calls. Called when he arrived. Finished job very fast. I will use the service and Trung Do again. It is great for someone who is disabled and more comfortable sitting at home and in a shop waiting room. I wish I had known about this service sooner.
2000 MAZDA 626 - OIL CHANGE
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Robert
28 years of experience
Fast, easy and efficient service with a smile
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91 reviews
Michael
21 years of experience
Michael was early for my appointment. He was very knowledgeable about the repairs he did on my vehicle and answered every question I had. It was a stress free reapair.
1997 MAZDA B2300 - CAR STARTER REPAIR
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
CarServiceYourMechanic PriceShop/Dealer Price
1986 Mazda 323L4-1.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$420.80Shop/Dealer Price$523.02 - $797.01
1994 Mazda 323L4-1.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$185.16Shop/Dealer Price$228.54 - $325.85
1991 Mazda 323L4-1.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$381.96Shop/Dealer Price$474.49 - $719.37
1991 Mazda 323L4-1.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$185.16Shop/Dealer Price$228.51 - $325.81
1993 Mazda 323L4-1.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$381.96Shop/Dealer Price$474.48 - $719.35
1989 Mazda 323L4-1.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$420.80Shop/Dealer Price$523.02 - $797.00
1989 Mazda 323L4-1.6L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$293.16Shop/Dealer Price$363.56 - $541.88
1988 Mazda 323L4-1.6L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$170.76Shop/Dealer Price$210.54 - $297.04
Show example Mazda 323 Oxygen Sensor Replacement prices

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