How to Service the Heated Oxygen Sensors on Mercury Mountaineer?

Place the vehicle on a hoist and set neutral before beginning service of the heated oxygen sensor (HO2S). The RH HO2S requires removal of two bolts before setting the heat shield to the side. First disconnect the HO2S electrical connector then apply penetrating and lock lubricant on the connector when needed to aid removal. You must use the exhaust gas oxygen sensor socket to uninstall the oxygen sensor known as HO2S. Before installation you must apply nickel anti-seize lubricant lightly to the threads of the new HO2S before tightening it to 41 Nm (30 lb-ft) using the original socket. Reinstall the HO2S electrical connector afterward before placing the heat shield if needed and fastening it with its 2 bolts at 20 Nm (177 lb-in) torque.

OEM Mercury Mountaineer Oxygen Sensors

Oxygen O2 Sensor

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Mercury Mountaineer Oxygen Sensor, Rear Driver Side Part Number: GU2Z-9G444-A
$56.02 MSRP: $92.18
You Save: $36.16 (40%)
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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:
- 1997-2010 Mercury Mountaineer | 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
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Mercury Mountaineer 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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2000-2001 Mercury Mountaineer | Base | 6 Cyl 4.0 L GAS, 8 Cyl 5.0 L GAS
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Mercury Mountaineer Oxygen Sensor, Front Passenger Side Part Number: XL3Z-9F472-AA
$69.62 MSRP: $114.55
You Save: $44.93 (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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2010, 2001 Mercury Mountaineer | Base, Convenience, Luxury, Premier | 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS
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Mercury Mountaineer Oxygen Sensor, Driver Side Part Number: F88Z-9F472-CA
$82.05 MSRP: $111.66
You Save: $29.61 (27%)
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Product Specifications
- Other Name: Sensor - Hego
- Position: Driver Side
- Replaces: F78Z-9F472-CA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1998-1999 Mercury Mountaineer | Base | 6 Cyl 4.0 L GAS, 8 Cyl 5.0 L GAS

Mercury Mountaineer 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 Mountaineer parts. We keep a wide inventory of OEM Mountaineer 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.

The Mercury Mountaineer Oxygen Sensors are the essential items that make great differences to the Mercury Mountaineer Oxygen vehicles. These sensors closely track the concentrations of unburned oxygen which can be present in the exhaust of an engine, thus ensuring that the air-fuel blend at the cylinders will allow the engines' fuel to combust efficiently and still produce as little emissions as possible. The Mercury Mountaineer Oxygen Sensors construct a voltage signal concerning the oxygen concentration making it possible for the engine control computer to modify the fuel injector pulse width hence giving a closed loop work that enhances the efficiency of the catalytic converter. Designed for Mercury Mountaineer models manufactured between 1996 and 2010, these sensors are usually zirconium dioxide ones, and the car may be equipped with narrow-band or wide-band ones for accurate air-fuel ration measurement. Rich/lean sensors are used in the narrow-band system, and wide-band are used in providing a broad band signal, overall improving vehicle performance and safety. The Mercury Mountaineer Oxygen Sensors should be checked from time to time as the degradation of the sensors results to higher emission rates and low fuel economy. The Mercury Mountaineer is popular for its luxury and powerful engine; thus, it is considered reliable, and its Oxygen Sensors are not exceptions to this in the auto market. As known, the Mercury Mountaineer Oxygen Sensors contribute to the enhancement of engine performance and lowered emission of hazardous gases; thus, taking part in the preservation of the car's quality and popularity among buyers who are in search of both comfort and durability.

Mercury Mountaineer Oxygen Sensors Parts and Q&A

Oxygen Sensor, Rear Driver Side
GU2Z-9G444-A
Q: How to Service the Heated Oxygen Sensors on Mercury Mountaineer?
A:
Place the vehicle on a hoist and set neutral before beginning service of the heated oxygen sensor (HO2S). The RH HO2S requires removal of two bolts before setting the heat shield to the side. First disconnect the HO2S electrical connector then apply penetrating and lock lubricant on the connector when needed to aid removal. You must use the exhaust gas oxygen sensor socket to uninstall the oxygen sensor known as HO2S. Before installation you must apply nickel anti-seize lubricant lightly to the threads of the new HO2S before tightening it to 41 Nm (30 lb-ft) using the original socket. Reinstall the HO2S electrical connector afterward before placing the heat shield if needed and fastening it with its 2 bolts at 20 Nm (177 lb-in) torque.