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%)
Ships in 1-2 Business Days
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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
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
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

If you own Mercury and want to keep it in top shape, choosing OEM Oxygen Sensors is a smart move. They are precisely engineered and follow strict factory standards. They are made in advanced facilities that use cutting edge technology. Each part goes through thorough testing to confirm strength and safety, so you can trust it. FordPartsDeal.com gives you genuine Mercury Oxygen Sensors at some of the affordable online prices without cutting quality. Every OEM Mercury part includes the manufacturer's warranty, easy returns, and super-fast delivery. So why wait? Shop now and get your vehicle back to peak condition.

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.