How to Service the Heated Oxygen Sensors (HO2S) on Mercury Cougar?

The service procedure for Heated Oxygen Sensor (HO2S) starts by removing its electrical connector then disorienting the electrical connector. You must first detach the dipstick as well as exhaust manifold heat shield before extracting the HO2S. Follow the reverse sequence of the removal process to install the part.

How to Service the Downstream Heated Oxygen Sensors (HO2S) on Mercury Villager?

One must begin service of the Heated Oxygen Sensor (HO2S) by disconnecting the battery ground cable first. Following vehicle elevation and support you can access the sensor. First disconnect the HO2S electrical connector then take off the sensor. Install the new sensor by following the opposite order of sensor removal process.

OEM Mercury Oxygen Sensors

Oxygen O2 Sensor

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54 Oxygen Sensors found

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Mercury 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
Fits the following Mercury Models:
- Mariner | 2005-2007 | Luxury, Premier | 6 Cyl 3.0 L GAS
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Mercury 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
Fits the following Mercury Models:
- Mariner | 2005-2007 | Luxury, Premier | 6 Cyl 3.0 L GAS
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Mercury Oxygen Sensor, Front Part Number: 7T4Z-9F472-A
$48.19 MSRP: $78.73
You Save: $30.54 (39%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Front Oxygen Sensor; Upper Oxygen Sensor
- Position: Front
Fits the following Mercury Models:
- Sable | 2008-2009 | Base, Premier | 6 Cyl 3.5 L GAS
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Mercury Oxygen Sensor, Rear Part Number: 5L8Z-9G444-K
$57.83 MSRP: $96.91
You Save: $39.08 (41%)
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Lower Oxygen Sensor
- Position: Rear
Fits the following Mercury Models:
- Mariner | 2009-2010 | Base, Premier | 4 Cyl 2.5 L GAS
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Mercury Oxygen Sensor, Rear Driver Side Part Number: BE5Z-9G444-A
$74.04 MSRP: $121.82
You Save: $47.78 (40%)
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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
Fits the following Mercury Models:
- Mariner | 2011 | Base, Hybrid, Premier | 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 6 Cyl 3.0 L FLEX
- Milan | 2011 | Hybrid, Premier | 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 6 Cyl 3.0 L FLEX
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Mercury 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
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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
Fits the following Mercury Models:
- Mariner | 2005-2010 | 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 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
Fits the following Mercury Models:
- Cougar | 2001-2002, 1992-1997 | Base, LS, XR-7 | 4 Cyl 2.0 L GAS, 6 Cyl 3.8 L GAS, 8 Cyl 5.0 L GAS
- Grand Marquis | 2000-2011, 1992-1995 | GS, GSL, Limited Edition, LS, LSE, Ultimate Edition | 8 Cyl 4.6 L FLEX, 8 Cyl 4.6 L GAS
- Marauder | 2003-2004 | Base | 8 Cyl 4.6 L GAS
- Mariner | 2005-2010 | 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
- Milan | 2006-2010 | Base, Hybrid, Premier | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
- Montego | 2005-2007 | Luxury, Premier | 6 Cyl 3.0 L GAS
- Monterey | 2004-2007 | Base, Convenience, Luxury, Premier | 6 Cyl 4.2 L GAS
- Mountaineer | 1997-2010 | Base, Convenience, Luxury, Premier | 6 Cyl 4.0 L FLEX, 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS, 8 Cyl 5.0 L GAS
- Mystique | 2000 | GS | 4 Cyl 2.0 L GAS
- Sable | 1991-2005 | G, GS, LS, LS Premium, LTS, Platinum Edition | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
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Mercury Oxygen Sensor, Rear Driver Side Part Number: 5F9Z-9G444-AB
$66.85 MSRP: $110.00
You Save: $43.15 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear, Rear Left; Rear Oxygen Sensor; Lower Oxygen Sensor
- Position: Rear Driver Side
- Replaces: 5F9Z-9G444-AA
Fits the following Mercury Models:
- Montego | 2005-2007 | Luxury, Premier | 6 Cyl 3.0 L GAS
- Sable | 2008-2009 | Base, Premier | 6 Cyl 3.5 L GAS
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Mercury Oxygen Sensor, Front Part Number: 8F9Z-9F472-A
$98.12 MSRP: $161.45
You Save: $63.33 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Front Or Rear
- Position: Front
Fits the following Mercury Models:
- Sable | 2008-2009 | Base, Premier | 6 Cyl 3.5 L GAS
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Mercury Oxygen Sensor, Front Part Number: 8F9Z-9F472-B
$95.91 MSRP: $157.82
You Save: $61.91 (40%)
Ships in 1 Business Day
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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
Fits the following Mercury Models:
- Mariner | 2008-2011 | 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
- Milan | 2010-2011 | Hybrid | 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV)
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Mercury Oxygen Sensor, Front Part Number: 9E5Z-9F472-D
$107.52 MSRP: $176.91
You Save: $69.39 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Position: Front
Fits the following Mercury Models:
- Mariner | 2010-2011 | Base, Premier | 6 Cyl 3.0 L FLEX
- Milan | 2010-2011 | Premier | 6 Cyl 3.0 L FLEX
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Mercury 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
Fits the following Mercury Models:
- Mariner | 2005-2007 | Luxury, Premier | 6 Cyl 3.0 L GAS
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Mercury Oxygen Sensor, Front Driver Side Part Number: XL3Z-9F472-BA
$38.47 MSRP: $61.09
You Save: $22.62 (38%)
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Left; Front Oxygen Sensor
- Position: Front Driver Side
Fits the following Mercury Models:
- Mountaineer | 2000-2001 | Base | 6 Cyl 4.0 L GAS, 8 Cyl 5.0 L GAS
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Mercury Oxygen Sensor, Front Part Number: 5L8Z-9F472-AA
$57.46 MSRP: $94.55
You Save: $37.09 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Left; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Rear
- Position: Front
Fits the following Mercury Models:
- Mariner | 2009 | Base, Premier | 6 Cyl 3.0 L GAS
- Milan | 2006-2009 | Base, Premier | 6 Cyl 3.0 L GAS
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Mercury Oxygen Sensor Part Number: F5MZ-9F472-B
$58.92 MSRP: $98.73
You Save: $39.81 (41%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego
Fits the following Mercury Models:
- Grand Marquis | 1996-1997 | GS, LS | 8 Cyl 4.6 L GAS
- Sable | 1996-1999 | G, GS, LS, LS Premium | 6 Cyl 3.0 L GAS
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Mercury Oxygen Sensor Part Number: F1TZ-9F472-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 Assembly
- Replaced by: GU2Z-9G444-A
Fits the following Mercury Models:
- Cougar | 1991
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Mercury Oxygen Sensor Part Number: F4ZZ-9F472-C
$56.02 MSRP: $92.18
You Save: $36.16 (40%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor - Hego
- Replaced by: GU2Z-9G444-A
Fits the following Mercury Models:
- Cougar | 1994-1997 | XR-7 | 8 Cyl 4.6 L GAS
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Mercury Oxygen Sensor Part Number: 9E5Z-9F472-B
$103.85 MSRP: $164.91
You Save: $61.06 (38%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Upper Oxygen Sensor
- Manufacturer Note: Front Or Rear
Fits the following Mercury Models:
- Milan | 2010 | Premier | 6 Cyl 3.0 L FLEX
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Mercury Oxygen Sensor, Front Part Number: BE5Z-9F472-B
$70.07 MSRP: $111.27
You Save: $41.20 (38%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Upper Oxygen Sensor
- Position: Front
Fits the following Mercury Models:
- Milan | 2011 | Base, Premier | 4 Cyl 2.5 L GAS
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Mercury Temperature Sensor Part Number: XF5Z-9F472-DA
$82.81 MSRP: $112.69
You Save: $29.88 (27%)
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor
- Manufacturer Note: With 3 pin connector , EGR gas temp. sensor
Fits the following Mercury Models:
- Villager | 1999-2002 | Base, Estate, Sport | 6 Cyl 3.3 L GAS

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Mercury 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 parts. We keep a wide inventory of OEM 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 Oxygen Sensors Parts and Q&A

Oxygen Sensor, Rear Driver Side
GU2Z-9G444-A
Q: How to Service the Heated Oxygen Sensors (HO2S) on Mercury Cougar?
A:
The service procedure for Heated Oxygen Sensor (HO2S) starts by removing its electrical connector then disorienting the electrical connector. You must first detach the dipstick as well as exhaust manifold heat shield before extracting the HO2S. Follow the reverse sequence of the removal process to install the part.
Temperature Sensor
XF5Z-9F472-DA
Q: How to Service the Downstream Heated Oxygen Sensors (HO2S) on Mercury Villager?
A:
One must begin service of the Heated Oxygen Sensor (HO2S) by disconnecting the battery ground cable first. Following vehicle elevation and support you can access the sensor. First disconnect the HO2S electrical connector then take off the sensor. Install the new sensor by following the opposite order of sensor removal process.