How to Service and Repair Oxygen Sensors on Mercury Mariner?

You should place the vehicle on a hoist in neutral position for servicing or repairing the heated oxygen sensor (HO2S). Disconnect the power outlet of the heated oxygen sensor. The application of penetrating and lock lubricant on sensor threads will help the removal process if required. The exhaust gas oxygen sensor socket helps remove the HO2S from its installation location. You should determine the torque wrench setting according to required values before installing the sensor where you will tighten it to 48 Nm (35 lb-ft). Following sensor installation reverse the removal procedure by applying anti-seize lubricant lightly to the HO2S threads.

OEM Mercury Mariner Oxygen Sensors

Oxygen O2 Sensor

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15 Oxygen Sensors found

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Mercury Mariner Oxygen Sensor, Rear Driver Side Part Number: YL8Z-9G444-AC
$51.27 MSRP: $84.36
You Save: $33.09 (40%)
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Product Specifications
- Other Name: Sensor Assembly; Oxygen Sensor, Rear Left; Sensor
- Position: Rear Driver Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2007 Mercury Mariner | Luxury, Premier | 6 Cyl 3.0 L GAS
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Mercury Mariner Oxygen Sensor, Rear Driver Side Part Number: GU2Z-9G444-A
$56.02 MSRP: $92.18
You Save: $36.16 (40%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Front, Front Left, Front Right, Rear, Rear Left, Rear Right; Rear Oxygen Sensor; Front Oxygen Sensor; Upper Oxygen Sensor; Lower Oxygen Sensor; Sensor
- Position: Rear Driver Side
- Replaces: 1R3Z-9G444-BA, 1R3Z-9G444-AA, 5F9Z-9G444-BA, 5W6Z-9G444-BA, 5C5Z-9F472-AA, DY-1091, DY-1005, DY-1063, DY-1089, DY-649, DY-1086, DY-1104, F1TZ-9F472-A, F4DZ-9F472-A, F6DZ-9G444-AA, F88Z-9F472-AA, F78Z-9F472-BA, F75Z-9G444-BA, DY-1081, DY-1060, DY-800, DY-831, DY-832, F3UZ-9F472-A, F4DZ-9F472-B, F4ZZ-9F472-C, F4UZ-9F472-A, F78Z-9F472-AA, F7RZ-9G444-BA, DY-1040, XC2Z-9F472-BA, F1SZ-9F472-A, XR3Z-9G444-BB, F5WZ-9F472-BA, 5C5Z-9F472-BA, 6E5Z-9G444-AA, 5W6Z-9G444-AA, DY-1034, DY-1093, DY-1058, F1SZ-9F472-B, 6L7Z-9F472-BA, DY-761, F5AZ-9G444-B, F4SZ-9F472-A, F77Z-9F472-BA, F6DZ-9G444-B, DY-1039, F85Z-9G444-E, F5UZ-9F472-A, F75Z-9G444-AA, F88Z-9F472-AB, F4SZ-9F472-D, F8RZ-9G444-BB, F85Z-9G444-AA, F85Z-9G444-AB, F88Z-9F472-BA, DY-1053, XR3Z-9G444-JA, XC2Z-9F472-AA, DY-1038, DY-703, F6DZ-9G444-EA, F5MZ-9F472-AA, DY-1087, FOTZ-9F472-A, DY-1057, XR3Z-9G444-EA, XR3Z-9G444-HA, DY-661, DY-731
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2010 Mercury Mariner | Base, Convenience, Hybrid, Luxury, Premier | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 6 Cyl 3.0 L GAS
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Mercury Mariner Oxygen Sensor, Rear Passenger Side Part Number: 5L8Z-9G444-A
$55.58 MSRP: $91.45
You Save: $35.87 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly; Oxygen Sensor, Rear Right; Rear Oxygen Sensor; Lower Oxygen Sensor; Sensor
- Position: Rear Passenger Side
- Replaces: 5L8Z-9G444-G, YL8Z-9G444-CA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2010 Mercury Mariner | Base, Luxury, Premier | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mercury Mariner Oxygen Sensor, Front Passenger Side Part Number: YL8Z-9F472-BA
$51.65 MSRP: $86.55
You Save: $34.90 (41%)
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front Right
- Position: Front Passenger Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2007 Mercury Mariner | Luxury, Premier | 6 Cyl 3.0 L GAS
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Mercury Mariner Oxygen Sensor, Front Driver Side Part Number: YL8Z-9F472-AA
$60.11 MSRP: $98.91
You Save: $38.80 (40%)
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Left
- Position: Front Driver Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2007 Mercury Mariner | Luxury, Premier | 6 Cyl 3.0 L GAS
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Mercury Mariner Oxygen Sensor, Rear Lower Part Number: BE5Z-9G444-B
$75.06 MSRP: $121.09
You Save: $46.03 (39%)
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear Left, Rear Right; Rear Oxygen Sensor; Lower Oxygen Sensor
- Manufacturer Note: Rear
- Position: Rear Lower
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011 Mercury Mariner | Base, Premier | 6 Cyl 3.0 L FLEX
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Mercury Mariner Oxygen Sensor, Front Part Number: 9E5Z-9F472-E
$101.88 MSRP: $164.36
You Save: $62.48 (39%)
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Upper Oxygen Sensor
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2010 Mercury Mariner | Base, Premier | 4 Cyl 2.5 L GAS
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Mercury Mariner Oxygen Sensor, Front Part Number: 5L8Z-9F472-BA
$55.69 MSRP: $91.64
You Save: $35.95 (40%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Right; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Rear
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2009 Mercury Mariner | Base, Convenience, Hybrid, Premier | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mercury Mariner Oxygen Sensor, Front Part Number: 5L8Z-9F472-AA
$57.46 MSRP: $94.55
You Save: $37.09 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Left; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Rear
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009 Mercury Mariner | Base, Premier | 6 Cyl 3.0 L GAS
View related parts
Mercury Mariner Oxygen Sensor, Rear Driver Side Part Number: BE5Z-9G444-A
$74.04 MSRP: $121.82
You Save: $47.78 (40%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear, Rear Left, Rear Right; Rear Oxygen Sensor; Lower Oxygen Sensor
- Position: Rear Driver Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011 Mercury Mariner | Base, Hybrid, Premier | 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 6 Cyl 3.0 L FLEX
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Mercury Mariner Oxygen Sensor, Front Part Number: 9E5Z-9F472-D
$107.52 MSRP: $176.91
You Save: $69.39 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2010-2011 Mercury Mariner | Base, Premier | 6 Cyl 3.0 L FLEX
View related parts
Mercury Mariner Oxygen Sensor, Front Part Number: 8F9Z-9F472-B
$95.91 MSRP: $157.82
You Save: $61.91 (40%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Right; Wideband Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Front Or Rear
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2008-2011 Mercury Mariner | Base, Hybrid, Premier | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
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Mercury Mariner Oxygen Sensor, Rear Part Number: 5L8Z-9G444-K
$57.83 MSRP: $96.91
You Save: $39.08 (41%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Lower Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2010 Mercury Mariner | Base, Premier | 4 Cyl 2.5 L GAS
View related parts
Mercury Mariner Oxygen Sensor, Rear Passenger Side Part Number: 5L8Z-9G444-F
$51.27 MSRP: $84.36
You Save: $33.09 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear, Rear Right; Rear Oxygen Sensor; Lower Oxygen Sensor; Sensor
- Manufacturer Note: Rear
- Position: Rear Passenger Side
- Replaces: 5L8Z-9G444-H, 5L8Z-9G444-J
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2007-2010 Mercury Mariner | Base, Luxury, Premier | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mercury Mariner Oxygen Sensor, Rear Part Number: BL8Z-9G444-A
$76.91 MSRP: $126.55
You Save: $49.64 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Lower Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011 Mercury Mariner | Base | 4 Cyl 2.5 L GAS

Mercury Mariner Oxygen Sensors

OEM Oxygen Sensors boasts unmatched quality. Each part goes through full quality checks. They adhere to Mercury's official factory standards. These steps remove flaws and inconsistencies. So you can get Oxygen Sensors with long life and a perfect fit. Come to our website and find genuine Mercury Mariner parts. We keep a wide inventory of OEM Mariner parts at the highly affordable prices. It's easy to search, compare, and pick what you need. You'll love the clear info and simple checkout. We offer top-rated customer service, and we reply fast. We also ship promptly to ensure your order arrives on time.

Mercury Mariner Oxygen Sensors Parts and Q&A

Oxygen Sensor, Rear
5L8Z-9G444-K
Q: How to Service and Repair Oxygen Sensors on Mercury Mariner?
A:
You should place the vehicle on a hoist in neutral position for servicing or repairing the heated oxygen sensor (HO2S). Disconnect the power outlet of the heated oxygen sensor. The application of penetrating and lock lubricant on sensor threads will help the removal process if required. The exhaust gas oxygen sensor socket helps remove the HO2S from its installation location. You should determine the torque wrench setting according to required values before installing the sensor where you will tighten it to 48 Nm (35 lb-ft). Following sensor installation reverse the removal procedure by applying anti-seize lubricant lightly to the HO2S threads.