How to Service the Heated Oxygen Sensor on Ford Flex?

Start the service of Heated Oxygen Sensor (HO2S) by first securing the vehicle on a hoist using neutral gear position. The electrical connector of the HO2S must be disconnected. Penetrating and lock lubricant serves to minimize resistance when removing the sensor by applying it to its threads. The Exhaust Gas Oxygen Sensor Socket enables you to remove the HO2S while following torque calculations for the specified torque level. Work through the following steps for new HO2S installation while applying light anti-seize lubrication to its threads then tight the sensor to 48 Nm (35 lb-ft). Continue by performing the removal steps in opposite order to finish the installation.

OEM Ford Flex Oxygen Sensor

Oxygen O2 Sensor

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17 Oxygen Sensors found

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Ford Flex Oxygen Sensor, Front Passenger Side Part Number: 8F9Z-9F472-H
$86.74 MSRP: $142.73
You Save: $55.99 (40%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Left, Front Right; Wideband Air/Fuel Sensor; Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Position: Front Passenger Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2013-2019 Ford Flex | Limited | 6 Cyl 3.5 L GAS
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Ford Flex 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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2010 Ford Flex | Limited, SEL | 6 Cyl 3.5 L GAS
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Ford Flex 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
ADD TO CART
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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2013-2016 Ford Flex | Limited, SE, SEL | 6 Cyl 3.5 L GAS
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Ford Flex Oxygen Sensor, Rear Part Number: FL3Z-9G444-A
$65.20 MSRP: $107.27
You Save: $42.07 (40%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Rear Oxygen Sensor; Lower Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2016-2019 Ford Flex | Limited, SE, SEL | 6 Cyl 3.5 L GAS
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Ford Flex Oxygen Sensor, Rear Lower Passenger Side Part Number: BA5Z-9G444-A
$67.52 MSRP: $111.09
You Save: $43.57 (40%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear Right; Rear Oxygen Sensor; Lower Oxygen Sensor
- Manufacturer Note: Rear
- Position: Rear Lower Passenger Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011-2019 Ford Flex | Limited, SEL, Titanium | 6 Cyl 3.5 L GAS
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Ford Flex 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
ADD TO CART
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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2010 Ford Flex | Base, Executive, Limited, SE, SEL | 3.5L V6, 6 Cyl 3.5 L GAS
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Ford Flex Oxygen Sensor, Front Part Number: FB5Z-9F472-A
$66.30 MSRP: $109.09
You Save: $42.79 (40%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Left, Front Right; Wideband Air/Fuel Sensor; Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Front Or Rear
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2016-2019 Ford Flex | Limited, SE, SEL | 6 Cyl 3.5 L GAS
View related parts
Ford Flex Oxygen Sensor, Rear Driver Side Part Number: BH6Z-9G444-A
$72.49 MSRP: $119.27
You Save: $46.78 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear, Rear Left; Rear Oxygen Sensor; Lower Oxygen Sensor
- Position: Rear Driver Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011-2019 Ford Flex | Limited, SE, SEL, Titanium | 6 Cyl 3.5 L GAS
View related parts
Ford Flex Oxygen Sensor, Front Part Number: BA5Z-9F472-B
$83.21 MSRP: $136.91
You Save: $53.70 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Front Or Rear
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011-2012 Ford Flex | Limited, SEL, Titanium | 6 Cyl 3.5 L GAS
View related parts
Ford Flex Oxygen Sensor, Front Part Number: BA5Z-9F472-A
$89.95 MSRP: $148.00
You Save: $58.05 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Front Or Rear
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011-2012 Ford Flex | Limited, SE, SEL, Titanium | 6 Cyl 3.5 L GAS
View related parts
Ford Flex Oxygen Sensor, Front Part Number: 8F9Z-9F472-B
$100.11 MSRP: $164.73
You Save: $64.62 (40%)
Ships in 1 Business Day
ADD TO CART
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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2010 Ford Flex | Limited, SEL | 6 Cyl 3.5 L GAS
View related parts
Ford Flex Oxygen Sensor, Front Part Number: 8F9Z-9F472-A
$88.51 MSRP: $145.64
You Save: $57.13 (40%)
Ships in 1-2 Business Days
ADD TO CART
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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2011 Ford Flex | Limited, SE, SEL, Titanium | 6 Cyl 3.5 L GAS
View related parts
Ford Flex Oxygen Sensor, Front Part Number: BL3Z-9F472-A
$155.81 MSRP: $256.36
You Save: $100.55 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Right; Wideband Air/Fuel Sensor; Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2013-2016 Ford Flex | Limited, SE, SEL | 6 Cyl 3.5 L GAS
View related parts
Ford Flex Oxygen Sensor, Front Part Number: 8F9Z-9F472-D
$132.60 MSRP: $218.18
You Save: $85.58 (40%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011 Ford Flex | Limited, SEL, Titanium | 6 Cyl 3.5 L GAS
View related parts
Ford Flex Oxygen Sensor, Front Part Number: 8F9Z-9F472-F
$94.87 MSRP: $159.27
You Save: $64.40 (41%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Manufacturer Note: Front Or Rear
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2010-2011 Ford Flex | Limited, SE, SEL, Titanium | 6 Cyl 3.5 L GAS
View related parts
Ford Flex 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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2013-2016 Ford Flex | Limited, SE, SEL | 6 Cyl 3.5 L GAS
View related parts
Ford Flex Oxygen Sensor, Rear Lower Passenger Side Part Number: AA5Z-9G444-A
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear, Rear Right; Lower Oxygen Sensor
- Manufacturer Note: Rear
- Position: Rear Lower Passenger Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2010 Ford Flex | Limited, SEL | 6 Cyl 3.5 L GAS

Ford Flex Oxygen Sensor

OEM Oxygen Sensor boasts unmatched quality. Each part goes through full quality checks. They adhere to Ford's official factory standards. These steps remove flaws and inconsistencies. So you can get Oxygen Sensor with long life and a perfect fit. Come to our website and find genuine Ford Flex parts. We keep a wide inventory of OEM Flex 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 function of a Ford Flex Oxygen Sensor is to take some emissions from the exhaust system that will tell the computer how much unburned oxygen is left over. The Ford Flex Oxygen Sensor then creates a signal that allows the engine computer to adjust how much fuel gets delivered and also allows the computer to validate limits on pollutants. The Oxygen Sensor consists of a zirconium dioxide element that is coated with platinum electrodes. This element is enclosed by a ceramic core and a threaded steel shell. Moreover, the sensor contrasts the oxygen in the exhaust with that in the outside air. In addition, the sensor voltage swings between about 0.9 volt (rich mixture) and 0.1 volt (lean mixture). An integrated heater quickly increases the Ford Oxygen Sensor to about 600°F after startup so closed-loop control begins quickly. The upstream Ford Flex Oxygen Sensor provides primary feedback while a downstream Flex unit is a catalyst monitor, which, when the converter operates correctly, should hover around 0.45 volts. Contamination from coolant silicates, or oil phosphorus, or silicone or carbon will slow response; a complete failure of a Ford Flex Oxygen Sensor traps the system in rich mode, increases emissions and lights the warning light.

Ford Flex Oxygen Sensor Parts and Q&A

Oxygen Sensor, Front
8F9Z-9F472-A
Q: How to Service the Heated Oxygen Sensor on Ford Flex?
A:
Start the service of Heated Oxygen Sensor (HO2S) by first securing the vehicle on a hoist using neutral gear position. The electrical connector of the HO2S must be disconnected. Penetrating and lock lubricant serves to minimize resistance when removing the sensor by applying it to its threads. The Exhaust Gas Oxygen Sensor Socket enables you to remove the HO2S while following torque calculations for the specified torque level. Work through the following steps for new HO2S installation while applying light anti-seize lubrication to its threads then tight the sensor to 48 Nm (35 lb-ft). Continue by performing the removal steps in opposite order to finish the installation.