What should be noted when servicing an oxygen sensor on Mazda 6?

When servicing an oxygen sensor, it is worth pointing out that such sensors are fitted at the exhaust manifold or pipe which at times is hard to loosen as it contracts when the engine is cold. To prevent scalding the sensor or the threading, it is advisable to wait a minute or two and first start the engine and then run the engine to avoid damaging the sensor or its screwing threads beforehand. Oxygen sensors are permanently fitted with a pigtail and electric connection that must not be broken or taken off because they will not help to use the sensor. Do not get grease, dirt, and other contaminants on the electrical connector or the louvered end of the sensor, and avoid using any cleaning solvents on it. Be gentle with the sensor to avoid dropping and rough handling of the sensor and make sure the silicone boot fits in place to prevent melting and complications in its operation. In case of replacement, both the upstream and downstream sensors are applicable and the former is located at the upper end of the exhaust manifold/catalytic converter assembly and the latter at the lower end or right below the catalyst. Start by unplugging the cable on the negative battery, and then lift the front part of the car and place on jackstands in order to work on the sensors. Lift off the engine cover, follow the electrical lead of the oxygen sensor to the connector, and disconnect the oxygen sensor. Unscrew the sensor using a wrench or oxygen socket. When re-fitting an old sensor, lubricate the threads of the sensor using antiseize compound; when used with a new sensor, then this is not necessary as it is already covered. Lastly, the process of installation is the opposite of the removal, which means securing the oxygen sensor to the required amount of torque.

Genuine Mazda 6 Oxygen Sensor

Oxygen O2 Sensor

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26 Oxygen Sensors found

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Mazda 6 Oxygen Sensor Part Number: AJF5-18-861A
$49.29 MSRP: $65.73
You Save: $16.44 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen; Front Oxygen Sensor
- Replaces: AJF5-18-861
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2008 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Oxygen Sensor Part Number: AJ58-18-861B
$91.86 MSRP: $122.51
You Save: $30.65 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen; Rear Oxygen Sensor
- Replaces: AJ58-18-861A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2008 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Oxygen Sensor Part Number: CA07-18-8G1A
$97.96 MSRP: $130.64
You Save: $32.68 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Air & Fuel Ratio; Front Oxygen Sensor, Oxygen Sensor
- Position: Rear
- Replaces: CA07-18-8G1
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2009-2010 Mazda 6 | S | 6 Cyl 3.7 L GAS
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Mazda 6 Oxygen Sensor Part Number: AJ60-18-861B
$100.18 MSRP: $133.59
You Save: $33.41 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Rear Oxygen Sensor
- Replaces: AJ60-18-861A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2005 Mazda 6 | i, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Oxygen Sensor Part Number: CA41-18-861
$113.08 MSRP: $150.80
You Save: $37.72 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Replaces: CA39-18-861
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2011-2013 Mazda 6 | S | 6 Cyl 3.7 L GAS
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Mazda 6 Oxygen Sensor Part Number: L334-18-861B
$108.50 MSRP: $144.70
You Save: $36.20 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen; Rear Oxygen Sensor
- Replaces: L334-18-861A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2005 Mazda 6 | i, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Oxygen Sensor Part Number: L519-18-861C
$121.03 MSRP: $161.41
You Save: $40.38 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen; Lower Oxygen Sensor
- Replaces: L519-18-861A, L519-18-861, L519-18-861B
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2009-2013 Mazda 6 | i, S | 4 Cyl 2.5 L GAS, 6 Cyl 3.7 L GAS
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Mazda 6 Oxygen Sensor Part Number: L518-18-8G1A
$128.80 MSRP: $171.76
You Save: $42.96 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Air & Fuel Ration; Oxygen Sensor
- Position: Upper
- Replaces: L518-18-8G1
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2009-2013 Mazda 6 | i, S | 4 Cyl 2.5 L GAS, 6 Cyl 3.7 L GAS
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Mazda 6 Oxygen Sensor Part Number: AJ59-18-861C
$126.80 MSRP: $169.10
You Save: $42.30 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Front Oxygen Sensor
- Replaces: AJ59-18-861B, AJ59-18-861A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2005 Mazda 6 | i, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Oxygen Sensor Part Number: CA09-18-861
$134.38 MSRP: $179.20
You Save: $44.82 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Front Oxygen Sensor, Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2009-2010 Mazda 6 | S | 6 Cyl 3.7 L GAS
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Mazda 6 Oxygen Sensor Part Number: L394-18-861A
$142.01 MSRP: $189.39
You Save: $47.38 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Rear Oxygen Sensor
- Replaces: L394-18-861
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2008 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Oxygen Sensor Part Number: L321-18-861B
$163.34 MSRP: $217.83
You Save: $54.49 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Front Oxygen Sensor
- Replaces: L321-18-861A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2005 Mazda 6 | i, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Oxygen Sensor Part Number: AJ57-18-861B
$165.75 MSRP: $221.04
You Save: $55.29 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Front Oxygen Sensor
- Replaces: AJ57-18-861A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2008 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Oxygen Sensor Part Number: PE12-18-86Z
$177.54 MSRP: $236.76
You Save: $59.22 (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:
- 2014-2021 Mazda 6 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature, Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda 6 Oxygen Sensor Part Number: L393-18-8G1C
$191.04 MSRP: $254.77
You Save: $63.73 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air & Fuel Ratio; Front Oxygen Sensor
- Replaces: L393-18-8G1A, L393-18-8G1, L393-18-8G1B
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2008 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
View related parts
Mazda 6 Oxygen Sensor Part Number: CA38-18-8G1
$217.83 MSRP: $290.49
You Save: $72.66 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air & Fuel Ratio
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2011-2013 Mazda 6 | S | 6 Cyl 3.7 L GAS
View related parts
Mazda 6 Oxygen Sensor Part Number: PYHK-18-86Z
$236.71 MSRP: $315.67
You Save: $78.96 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Lower Oxygen Sensor, Oxygen Sensor
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2018-2021 Mazda 6 | Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda 6 Oxygen Sensor Part Number: PY8V-18-8G1
$261.28 MSRP: $348.43
You Save: $87.15 (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
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2018-2021 Mazda 6 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature | 4 Cyl 2.5 L GAS
View related parts
Mazda 6 Oxygen Sensor Part Number: L3M6-18-8G1F
$263.85 MSRP: $351.87
You Save: $88.02 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air & Fuel Ratio; Upper Oxygen Sensor
- Replaces: L3M6-18-8G1D, L3M6-18-8G1A, L3M6-18-8G1E
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2007 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
View related parts
Mazda 6 Oxygen Sensor Part Number: L3M7-18-861C-9U
Product Specifications
- Other Name: Sensor, Oxygen; Lower Oxygen Sensor
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2007 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS

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1-20 of 26 Results

Mazda 6 Oxygen Sensor

The Mazda 6 Oxygen Sensor is the exhaust monitor in the car which provides a regular report in terms of rich or lean mixes to the engine computer, thus ensuring that there is always smooth power and low emissions. Platinum is placed on a core of zirconium dioxide, enclosed in a shell of steel, to compare the remaining oxygen with the outside air and change its voltage between approximately 0.1 and 0.9 volts. The computer interprets that the high rate of swing and the adjustment of injector pulse width numerous times per second allow the catalytic converter to operate at its optimal temperature. To accelerate the transition to closed loop control, each Oxygen Sensor is equipped with a heater that rapidly heats it to about 600 degrees. The new Mazda models have two units, an upstream sensor which controls fueling and a downstream sensor to confirm the efficiency of the converter and lights up the warning lamp when the two are in agreement. Older sensors are traditional, and just vary between high and low voltage, whereas more recent wideband air fuel ratio sensors operate over a larger range, providing the computer with a more precise command at all loads. Oil, coolant, silicone or heavy carbon may coat the element, increasing the lag in its response, increasing fuel consumption and emissions, and a dead sensor causes a rich default mixture to be stored in the element, which activates codes and switches on the check engine light. When such an event occurs the drivers of the second Mazda 6 can restore mileage and clean emissions by installing a new Oxygen Sensor, maintaining the Mazda powertrain as they are supposed to.

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 6 parts. Enjoy the highly competitive prices online. Our site is your one-stop shop. Each genuine 6 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 6 Oxygen Sensor Parts and Q&A

Oxygen Sensor
AJF5-18-861A
Q: What should be noted when servicing an oxygen sensor on Mazda 6?
A:
When servicing an oxygen sensor, it is worth pointing out that such sensors are fitted at the exhaust manifold or pipe which at times is hard to loosen as it contracts when the engine is cold. To prevent scalding the sensor or the threading, it is advisable to wait a minute or two and first start the engine and then run the engine to avoid damaging the sensor or its screwing threads beforehand. Oxygen sensors are permanently fitted with a pigtail and electric connection that must not be broken or taken off because they will not help to use the sensor. Do not get grease, dirt, and other contaminants on the electrical connector or the louvered end of the sensor, and avoid using any cleaning solvents on it. Be gentle with the sensor to avoid dropping and rough handling of the sensor and make sure the silicone boot fits in place to prevent melting and complications in its operation. In case of replacement, both the upstream and downstream sensors are applicable and the former is located at the upper end of the exhaust manifold/Catalytic Converter assembly and the latter at the lower end or right below the catalyst. Start by unplugging the cable on the negative battery, and then lift the front part of the car and place on jackstands in order to work on the sensors. Lift off the engine cover, follow the electrical lead of the oxygen sensor to the connector, and disconnect the oxygen sensor. Unscrew the sensor using a wrench or oxygen socket. When re-fitting an old sensor, lubricate the threads of the sensor using antiseize compound; when used with a new sensor, then this is not necessary as it is already covered. Lastly, the process of installation is the opposite of the removal, which means securing the oxygen sensor to the required amount of torque.