How to safely and effectively service the Heated Oxygen Sensors (HO2S) on Mercury Grand Marquis?

In order to service the Heated Oxygen Sensor (HO2S), shut off the fire suppression system and place the vehicle in neutral. Unplug the HO2S connector, lubricate the threads and remove it using the Exhaust Gas Oxygen Sensor Socket. Install with 40 Nm (30 lb-ft) torque and anti-seize lubricant and re-power the fire system.

OEM Mercury Grand Marquis Oxygen Sensors

Oxygen O2 Sensor

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6 Oxygen Sensors found

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Mercury Grand Marquis Oxygen Sensor Part Number: F8VZ-9F472-BA
$57.02 MSRP: $78.88
You Save: $21.86 (28%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1998-2002 Mercury Grand Marquis | GS, LS | 8 Cyl 4.6 L GAS
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Mercury Grand Marquis 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:
- 2000-2011, 1992-1995 Mercury Grand Marquis | GS, GSL, Limited Edition, LS, LSE, Ultimate Edition | 8 Cyl 4.6 L FLEX, 8 Cyl 4.6 L GAS
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Mercury Grand Marquis Oxygen Sensor Part Number: F5MZ-9F472-B
$55.77 MSRP: $93.45
You Save: $37.68 (41%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1996-1997 Mercury Grand Marquis | GS, LS | 8 Cyl 4.6 L GAS
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Mercury Grand Marquis Oxygen Sensor Part Number: F4ZZ-9F472-B
$70.74 MSRP: $96.27
You Save: $25.53 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1995 Mercury Grand Marquis | GS, LS | 8 Cyl 4.6 L GAS
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Mercury Grand Marquis Oxygen Sensor Part Number: FO3Z-9F472-A
Product Specifications
- Other Name: Sensor - Hego; Exhaust Temperature Sensor
- Replaces: FOPZ-9F472-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1991 Mercury Grand Marquis | GS, LS | 8 Cyl 5.0 L GAS
View related parts
Mercury Grand Marquis Oxygen Sensor Part Number: F8VZ-9F472-AA
Product Specifications
- Other Name: Sensor - Hego
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1998-1999 Mercury Grand Marquis | GS, LS | 8 Cyl 4.6 L GAS

Mercury Grand Marquis Oxygen Sensors

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Mercury Grand Marquis Oxygen Sensors Parts and Q&A

Oxygen Sensor, Rear Driver Side
GU2Z-9G444-A
Q: How to safely and effectively service the Heated Oxygen Sensors (HO2S) on Mercury Grand Marquis?
A: In order to service the Heated Oxygen Sensor (HO2S), shut off the fire suppression system and place the vehicle in neutral. Unplug the HO2S connector, lubricate the threads and remove it using the Exhaust Gas Oxygen Sensor Socket. Install with 40 Nm (30 lb-ft) torque and anti-seize lubricant and re-power the fire system.