How should one service an oxygen sensor to avoid damage and ensure proper installation on Mazda 3?

Handling an oxygen sensor: When cleaning an oxygen sensor, beware that it is fitted in exhaust manifold or pipe that may shrink during cooling process and hence it is hard to loosen when the engine is cold. To prevent damaging sensor or its mounting threads it is better to turn the engine on a minute or two then turn it off without burning yourself. The pigtail and electrical connector on oxygen sensors cannot be removed, and the destruction of any of them will cause the sensor to become useless. Avoid exposing the electrical connector and the louvered tip of the sensor to grease, dirt, or any other type of contaminant and should never apply any cleaning solvents to it. Be careful with the sensor to prevent drops or a rough treatment of the sensor, and make sure that the silicone boot is properly attached, and it does not melt and cause any operational problems. De-connect the cable with the negative battery post, raise the front of the vehicle, and hold it up with jackstands in place, and then remove the engine under-cover. On the upstream oxygen sensor, it is in the top of the catalytic converter assembly/integral exhaust manifold where you unscrew the sensor using a wrench or socket, dislinked the electrical connector, and disassembled any harness clips. When reinstalling the old sensor, place anti-seize compound on the threads, or in the case of a new sensor, there is some anti-seize compound on the new sensor. Installation is done in reverse order and this means that sensor is secured by tightening. In the case of downstream oxygen sensors, California emission models include two, non-California ones include one, which is in the lower end of the exhaust manifold/catalytic converter assembly or on the short part of the exhaust pipe after the catalyst. Identify the downstream sensor, unscrew the sensor, and unscrew the electrical connector, and unscrew any harness clips. Once more, use anti-seize compound in the event of re-installing the old sensor and tighten the sensor during installation.

Genuine Mazda 3 Oxygen Sensor

Oxygen O2 Sensor

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29 Oxygen Sensors found

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Mazda 3 Oxygen Sensor Part Number: PEDE-18-86Z
$131.85 MSRP: $175.83
You Save: $43.98 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen; Oxygen Sensor
- Position: Lower
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2018 Mazda 3 | i Grand Touring, I Sport, i SV, I Touring, Sport, Touring | 4 Cyl 2.0 L GAS
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Mazda 3 Oxygen Sensor Part Number: LF66-18-861C-9U
$155.44 MSRP: $207.29
You Save: $51.85 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Replaces: LF66-18-861B-9U
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2004-2006 Mazda 3 | i, S, SP23 | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
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Mazda 3 Oxygen Sensor Part Number: L5D9-18-86ZC
$169.39 MSRP: $225.89
You Save: $56.50 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Lower Oxygen Sensor
- Replaces: L5D9-18-86ZA
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2011-2013 Mazda 3 | S | 4 Cyl 2.5 L GAS
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Mazda 3 Oxygen Sensor Part Number: PE08-18-86ZA
$171.04 MSRP: $228.09
You Save: $57.05 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Oxygen Sensor
- Position: Lower
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2012-2013 Mazda 3 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Oxygen Sensor Part Number: L541-18-861A
$172.09 MSRP: $229.49
You Save: $57.40 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Lower Oxygen Sensor, Oxygen Sensor
- Replaces: L541-18-861A-9U, L541-18-861
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2010-2013 Mazda 3 | i, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Oxygen Sensor Part Number: PE12-18-86Z
$177.54 MSRP: $236.76
You Save: $59.22 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Oxygen Sensor
- Position: Lower
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2018 Mazda 3 | Grand Touring, i Grand Touring, I Sport, i SV, I Touring, s Grand Touring, s Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Oxygen Sensor Part Number: PE07-18-8G1
$184.79 MSRP: $246.43
You Save: $61.64 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air & Fuel Ratio; Oxygen Sensor
- Position: Upper
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2012-2013 Mazda 3 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Oxygen Sensor Part Number: LF3T-18-8G1
$198.36 MSRP: $264.54
You Save: $66.18 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air & Fuel Ratio; Oxygen Sensor
- Position: Upper
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2010-2011 Mazda 3 | i | 4 Cyl 2.0 L GAS
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Mazda 3 Oxygen Sensor Part Number: L5D8-18-8G1
$200.18 MSRP: $266.96
You Save: $66.78 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air & Fuel Ratio; Oxygen Sensor
- Position: Upper
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2011-2013 Mazda 3 | S | 4 Cyl 2.5 L GAS
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Mazda 3 Oxygen Sensor Part Number: LFJD-18-8G1A
$200.41 MSRP: $267.27
You Save: $66.86 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air & Fuel Ratio; Oxygen Sensor
- Position: Upper
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2012-2013 Mazda 3 | i | 4 Cyl 2.0 L GAS
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Mazda 3 Oxygen Sensor Part Number: LFL8-18-861C
$204.80 MSRP: $273.12
You Save: $68.32 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Replaces: LFL8-18-861A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2007-2009 Mazda 3 | i | 4 Cyl 2.0 L GAS
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Mazda 3 Oxygen Sensor Part Number: LF8R-18-8G1A
$205.56 MSRP: $274.14
You Save: $68.58 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air & Fuel Ratio; Oxygen Sensor
- Position: Upper
- Replaces: LF8R-18-8G1
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2010-2011 Mazda 3 | i | 4 Cyl 2.0 L GAS
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Mazda 3 Oxygen Sensor Part Number: L34B-18-861B
$224.21 MSRP: $299.01
You Save: $74.80 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Lower Oxygen Sensor
- Replaces: L34B-18-861A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2007-2013 Mazda 3 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
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Mazda 3 Oxygen Sensor Part Number: L32D-18-861D-9U
$262.71 MSRP: $350.36
You Save: $87.65 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Replaces: L32D-18-861D, L32D-18-861A-9U, L32D-18-861B, L32D-18-861A, L32D-18-861
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2009 Mazda 3 | Mazdaspeed, S | 4 Cyl 2.3 L GAS
View related parts
Mazda 3 Oxygen Sensor Part Number: LFL8-18-861-9U
$246.13 MSRP: $328.23
You Save: $82.10 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Replaces: LFL8-18-861
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2007 Mazda 3 | i | 4 Cyl 2.0 L GAS
View related parts
Mazda 3 Oxygen Sensor Part Number: PAF1-18-86ZA
$267.44 MSRP: $356.65
You Save: $89.21 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Replaces: PAF1-18-86Z
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2019-2024 Mazda 3 | 2.0, 2.5 Carbon Turbo, 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Base, Carbon Edition, Preferred, Premium, Select, Select Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Oxygen Sensor Part Number: L32F-18-861A
$249.08 MSRP: $332.17
You Save: $83.09 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Replaces: L32F-18-861
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2009 Mazda 3 | Mazdaspeed, S | 4 Cyl 2.3 L GAS
View related parts
Mazda 3 Oxygen Sensor Part Number: PYFA-18-8G1A
$318.70 MSRP: $425.02
You Save: $106.32 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air&Fuel Ratio
- Replaces: PYFA-18-8G1
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2019-2024 Mazda 3 | 2.0, 2.5 Carbon Turbo, 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Base, Carbon Edition, Preferred, Premium, Select, Select Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
View related parts
Mazda 3 Oxygen Sensor Part Number: L540-18-8G1
$323.89 MSRP: $431.94
You Save: $108.05 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air & Fuel Ratio; Upper Oxygen Sensor
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2010-2011 Mazda 3 | S | 4 Cyl 2.5 L GAS
View related parts
Mazda 3 Oxygen Sensor Part Number: PE01-18-8G1A
$343.68 MSRP: $458.33
You Save: $114.65 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air&Fuel Ratio; Front Oxygen Sensor, Oxygen Sensor
- Position: Upper
- Replaces: PE01-18-8G1
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2018 Mazda 3 | Grand Touring, i Grand Touring, I Sport, i SV, I Touring, s Grand Touring, s Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS

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1-20 of 29 Results

Mazda 3 Oxygen Sensor

The Mazda 3 Oxygen Sensor is a small component that is mounted on the exhaust whose primary duty is to measure the amount of oxygen that is left in the exhaust gases, after which the engine control unit can adjust the fuel mixture needed to provide the engine with the right power, economy, and low emissions. The Mazda 3 exhaust stream has an Oxygen Sensor that compares the oxygen level in the exhaust with that in the outside air and prepares a voltage signal, which immediately causes the ECU to make a fuel adjustment that helps the car comply with emission regulations and prevents wastage of fuel. In Mazda Skyactiv-equipped sedans and hatchbacks, modern units include an internal heater to ensure that they reach optimal operating temperature after power-on within a matter of seconds, to minimize cold-run pollution. There are two leading Mazda technologies that have emerged in small Mazdas over the years, which are zirconia and titania. Zirconia elements are supreme and are available in narrow-band operation, switching between rich and lean thresholds, and in wideband operation, providing a smooth linear output to allow the ECU to finely tune the mixture at all loads. Titania versions change electrical resistance instead of voltage and offer a lighter sensor but need a special control circuit. In any style of Oxygen Sensor installed, all Oxygen Sensors will protect the catalytic converters, maximize mileage, and ensure that all Mazda 3 vehicles adhere to the standards of environmental care.

Looking for Oxygen Sensor with proven quality? Choose OEM Oxygen Sensor. Mazda designs and builds them to strict factory specs. Every piece goes through rigorous quality checks. You'll get parts that fit right and work like new. Shop our huge inventory of OEM Mazda 3 parts. Enjoy the highly competitive prices online. Our site is your one-stop shop. Each genuine 3 part includes a manufacturer's warranty. Buy with confidence. Our return policy is simple and hassle-free. In a rush? Choose expedited delivery at checkout. You'll love the streamlined experience from search to checkout to receiving your order.

Mazda 3 Oxygen Sensor Parts and Q&A

Oxygen Sensor
L32D-18-861D-9U
Q: How should one service an oxygen sensor to avoid damage and ensure proper installation on Mazda 3?
A:
Handling an oxygen sensor: When cleaning an oxygen sensor, beware that it is fitted in exhaust manifold or pipe that may shrink during cooling process and hence it is hard to loosen when the engine is cold. To prevent damaging sensor or its mounting threads it is better to turn the engine on a minute or two then turn it off without burning yourself. The pigtail and electrical connector on oxygen sensors cannot be removed, and the destruction of any of them will cause the sensor to become useless. Avoid exposing the electrical connector and the louvered tip of the sensor to grease, dirt, or any other type of contaminant and should never apply any cleaning solvents to it. Be careful with the sensor to prevent drops or a rough treatment of the sensor, and make sure that the silicone boot is properly attached, and it does not melt and cause any operational problems. De-connect the cable with the negative battery post, raise the front of the vehicle, and hold it up with jackstands in place, and then remove the engine under-cover. On the upstream oxygen sensor, it is in the top of the Catalytic Converter assembly/integral exhaust manifold where you unscrew the sensor using a wrench or socket, dislinked the electrical connector, and disassembled any harness clips. When reinstalling the old sensor, place anti-seize compound on the threads, or in the case of a new sensor, there is some anti-seize compound on the new sensor. Installation is done in reverse order and this means that sensor is secured by tightening. In the case of downstream oxygen sensors, California emission models include two, non-California ones include one, which is in the lower end of the exhaust manifold/catalytic converter assembly or on the short part of the exhaust pipe after the catalyst. Identify the downstream sensor, unscrew the sensor, and unscrew the electrical connector, and unscrew any harness clips. Once more, use anti-seize compound in the event of re-installing the old sensor and tighten the sensor during installation.