How to Service the Downstream Heated Oxygen Sensor (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.

How to Service the Heated Oxygen Sensor (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.

OEM Mercury Oxygen Sensor

Oxygen O2 Sensor

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54 Oxygen Sensors found

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Mercury Oxygen Sensor, Rear Driver Side Part Number: GU2Z-9G444-A
$57.57 MSRP: $94.73
You Save: $37.16 (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
- Position: Rear Driver Side
- Replaces: F1TZ-9F472-A, F85Z-9G444-AA, F88Z-9F472-AA, 1R3Z-9G444-AA, 1R3Z-9G444-BA, DY-1081, F4DZ-9F472-A, 5C5Z-9F472-AA, 5C5Z-9F472-BA, 5F9Z-9G444-BA, 5W6Z-9G444-BA, 6E5Z-9G444-AA, F85Z-9G444-AB, F85Z-9G444-E, F88Z-9F472-AB, 6L7Z-9F472-BA, 5W6Z-9G444-AA, DY-1091, DY-1086, DY-1087, DY-1053, DY-1060, DY-800, DY-831, DY-832, DY-1034, DY-661, DY-731, DY-1040, F4SZ-9F472-A, DY-1057, DY-1104, DY-1039, F1SZ-9F472-B, DY-1038, DY-1089, DY-1093, DY-649, DY-1063, DY-1005, DY-761, F1SZ-9F472-A, DY-703, F3UZ-9F472-A, F4ZZ-9F472-C, F5AZ-9G444-B, F4SZ-9F472-D, F6DZ-9G444-B, F4UZ-9F472-A, F5UZ-9F472-A, F4DZ-9F472-B, F78Z-9F472-AA, F7RZ-9G444-BA, F75Z-9G444-AA, F5WZ-9F472-BA, F6DZ-9G444-AA, F88Z-9F472-BA, F75Z-9G444-BA, F77Z-9F472-BA, F8RZ-9G444-BB, F5MZ-9F472-AA, F78Z-9F472-BA, DY-1058, F6DZ-9G444-EA, FOTZ-9F472-A, XR3Z-9G444-EA, XC2Z-9F472-BA, XR3Z-9G444-JA, XR3Z-9G444-HA, XR3Z-9G444-BB, XC2Z-9F472-AA
Fits the following Mercury Models:
- Capri | 1991-1994 | 1.6L L4
- Cougar | 1999-2002, 1990-1997 | Base, LS, XR-7 | 2.0L L4, 2.5L V6, 3.8L V6, 4 Cyl 2.0 L GAS, 4.6L V8, 5.0L V8, 6 Cyl 3.8 L GAS, 8 Cyl 4.6 L GAS, 8 Cyl 5.0 L GAS
- Grand Marquis | 1990-2011 | GS, GSL, Limited Edition, LS, LSE, Ultimate Edition | 4.6L V8, 5.0L V8, 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, DX, Ford Hybrid, Hybrid, Limited, LX, Mercury Convenience, Mercury Hybrid, Mercury Luxury, Mercury Premier, Premier, XL, XLS, XLT | 2.3L L4, 2.5L L4, 3.0L V6, 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, High Version - Car, Hybrid, Low Version - Car, Mid Version - Car, Premier, Sport | 2.3L L4, 2.5L L4, 3.0L V6, 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 | Base, Deluxe, Limited, Luxury, Premier, SE, SEL | 3.0L V6, 6 Cyl 3.0 L GAS
- Monterey | 2004-2007 | Base, Convenience, Limited, Luxury, Mercury Convenience, Mercury Luxury, Mercury Premier, Premier, SE, SEL, SES | 3.9L V6, 4.2L V6, 6 Cyl 4.2 L GAS
- Mountaineer | 1997-2010 | Base, Convenience, Eddie Bauer, Elite, Limited, Luxury, Mercury Luxury, Mercury Premier, Mountaineer Version, Premier, XLS, XLT | 4.0L V6, 4.6L V8, 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 | 1995-2000 | 2.0L L4, 2.5L V6
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Mercury Oxygen Sensor, Rear Driver Side Part Number: BE5Z-9G444-A
$81.11 MSRP: $133.45
You Save: $52.34 (40%)
Ships in 1 Business Day
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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 Driver Side Part Number: YL8Z-9G444-AC
$58.23 MSRP: $95.82
You Save: $37.59 (40%)
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Product Specifications
- Other Name: Sensor Assembly; Oxygen Sensor, Rear Left; Sensor
- Position: 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, Rear Passenger Side Part Number: 5L8Z-9G444-F
$58.23 MSRP: $95.82
You Save: $37.59 (40%)
Ships in 1-2 Business Days
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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
Fits the following Mercury Models:
- Mariner | 2007-2010 | Base, Ford Hybrid, Limited, Mercury Convenience, Mercury Hybrid, Mercury Luxury, Mercury Premier, Premier, XLS, XLT | 3.0L V6, 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
- Milan | 2006-2009 | Base, High Version - Car, Hybrid, Low Version - Car, Mid Version - Car, Premier, Sport | 3.0L V6, 6 Cyl 3.0 L GAS
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Mercury Oxygen Sensor, Front Part Number: 5L8Z-9F472-BA
$55.47 MSRP: $91.27
You Save: $35.80 (40%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Right; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Rear
- Position: Front
Fits the following Mercury Models:
- Mariner | 2005-2009 | 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
- Milan | 2006-2010 | Base, Premier | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS, 6 Cyl 3.0 L GAS
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Mercury Oxygen Sensor, Front Passenger Side Part Number: YL8Z-9F472-BA
$60.11 MSRP: $98.91
You Save: $38.80 (40%)
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front Right
- Position: 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, Rear Passenger Side Part Number: 5L8Z-9G444-A
$59.01 MSRP: $97.09
You Save: $38.08 (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, DX, Ford Hybrid, Limited, Luxury, LX, Mercury Convenience, Mercury Hybrid, Mercury Luxury, Mercury Premier, Premier, XL, XLS, XLT | 3.0L V6, 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 Part Number: 5L8Z-9G444-K
$58.90 MSRP: $96.91
You Save: $38.01 (40%)
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, Front Driver Side Part Number: YL8Z-9F472-AA
$60.11 MSRP: $98.91
You Save: $38.80 (40%)
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Left
- Position: 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 Part Number: 5L8Z-9F472-AA
$59.45 MSRP: $97.82
You Save: $38.37 (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, 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 | Base, Deluxe, Limited, Luxury, Premier, SE, SEL | 3.0L V6, 6 Cyl 3.0 L GAS
- Sable | 2008-2009 | Base, Premier | 6 Cyl 3.5 L GAS
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Mercury Oxygen Sensor, Rear Part Number: BE5Z-9G444-C
$68.51 MSRP: $112.73
You Save: $44.22 (40%)
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:
- Milan | 2011 | Base, Premier | 4 Cyl 2.5 L GAS
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Mercury Oxygen Sensor, Front Passenger Side Part Number: XL3Z-9F472-AA
$66.52 MSRP: $109.45
You Save: $42.93 (40%)
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Right; Rear Oxygen Sensor; Front Oxygen Sensor
- Position: Front Passenger Side
Fits the following Mercury Models:
- Monterey | 2004-2007 | Base, Convenience, Luxury, Premier | 6 Cyl 4.2 L GAS
- Mountaineer | 2006-2010, 2001 | Base, Convenience, Luxury, Premier | 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS
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Mercury Oxygen Sensor, Front Part Number: 8F9Z-9F472-B
$100.11 MSRP: $164.73
You Save: $64.62 (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: 8F9Z-9F472-A
$88.51 MSRP: $145.64
You Save: $57.13 (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: 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, Front Driver Side Part Number: XL3Z-9F472-BA
$48.89 MSRP: $77.64
You Save: $28.75 (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: 9E5Z-9F472-D
$113.82 MSRP: $187.27
You Save: $73.45 (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 Part Number: F8VZ-9F472-BA
$71.28 MSRP: $98.60
You Save: $27.32 (28%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego
Fits the following Mercury Models:
- Grand Marquis | 1998-2002 | GS, LS | 8 Cyl 4.6 L GAS
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Mercury Oxygen Sensor, Rear Lower Part Number: BE5Z-9G444-B
$84.04 MSRP: $133.45
You Save: $49.41 (38%)
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear Left, Rear Right; Rear Oxygen Sensor; Lower Oxygen Sensor
- Manufacturer Note: Rear
- Position: Passenger Side
Fits the following Mercury Models:
- Mariner | 2011 | Base, Premier | 6 Cyl 3.0 L FLEX

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Mercury Oxygen Sensor

If you own Mercury and want to keep it in top shape, choosing OEM Oxygen Sensor 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 Sensor 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 Sensor maintains exhaust clean and uses fuel low throughout the entire lineup. Mercury, named after the fleet-footed Roman deity, thrust that into cars with comfortable springs, heavy sound deadening, broad benches, sharp sheet-metal lines, and dashboards intermingled with the speed of control. The cabins of Mercury were silent with built-in insulation, sealed doors, and suspensions that were modified to eliminate pothole chatter on lengthy highway journeys. Mercury found the right balance between price and polish, allowing families to have spacious sedans that were stylish and bumped down roads without emptying wallets or requiring car-fussy maintenance. Mercury continued to roll out creature comfort additions and simple technological enhancements-power steering additions, improved auto shifts, anti-noise glass, etc. Even until production came to a halt in 2011. The lineup had smaller cross-state drive luggage-consuming proportions that could fit and park without challenges. Oxygen Sensor is mounted on the exhaust stream and detect the amount of leftover oxygen in the exhaust to allow the computer to immediately reduce the amount of fuel applied, cut emissions, protect the catalyst, and extract more miles out of each gallon. Oxygen Sensor alternates rich and lean signals in milliseconds, maintain torque constant, and prevent throttle-based stumbling. Oxygen Sensor is heat, moisture, and carbon free and therefore could contribute years of uninterrupted information without any form of creeping on the to-do list. The Oxygen Sensor is easily fitted to both past and present models, giving confidence to the owners.

Mercury Oxygen Sensor Parts and Q&A

Temperature Sensor
XF5Z-9F472-DA
Q: How to Service the Downstream Heated Oxygen Sensor (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.
Oxygen Sensor, Rear Driver Side
GU2Z-9G444-A
Q: How to Service the Heated Oxygen Sensor (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.