How to Service and Repair Oxygen Sensor on Ford Focus?

The first step for repairing or servicing the Heated Oxygen Sensor (HO2S) consists of placing the vehicle on a hoist platform with the transmission set to neutral. Disconnect the battery ground cable. The service on HO2S requires disconnecting power connectors from equipment with secondary air injection while detaching wiring retainers and removing the EVAP purging valve heat shield. Reinstall the heat shield through snapping after completing the installation. You should unfasten the exhaust manifold heat shield by removing its four bolts before placing it away so you can reinstall with a torque of 11 Nm (8 lb-ft). Use penetrating and lock lubricant on the HO2S before using a 22 mm crows foot wrench to remove it while tightening to 48 Nm (35 lb-ft) when installing the sensor. Unsnap the electrical connector heat shield from vehicles without secondary air injection before disconnecting the electrical connector and detaching the wiring retainer. For smooth removal of the HO2S apply lubrication if needed before using the 22 mm crows foot wrench in a manner where you tighten it to 48 Nm (35 lb-ft) upon completion. After positioning the sensor wiring correctly around hot surfaces and away from edges, make sure that all retainers secure it and that the electrical connector locking tab is firmly engaged. Users should coat the threaded sections of professionals sensors with anti-seize lubricant before sensor installation. The reverse process should then be used to finish the installation.

OEM Ford Focus Oxygen Sensor

Oxygen O2 Sensor

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18 Oxygen Sensors found

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Ford Focus Oxygen Sensor, Rear Part Number: DS7Z-9F472-A
$86.74 MSRP: $142.73
You Save: $55.99 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Rear; Wideband Air/Fuel Sensor; Front Oxygen Sensor; Upper Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2014-2018 Ford Focus | S, SE, SEL, Titanium | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
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Ford Focus 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:
- 2012-2013 Ford Focus | S, SE, SEL, Titanium | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
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Ford Focus 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:
- 2000-2007 Ford Focus | LX, S, SE, SE Wagon, SEL, Series 25, SES, Sony Limited Edition, ST, SVT, SVT 3 Door, SVT 5 Door, ZTS, ZTW, ZX3, ZX4, ZX5, ZXW | 2.0L L4, 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
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Ford Focus Oxygen Sensor, Front Part Number: 5S4Z-9F472-AA
$56.13 MSRP: $92.36
You Save: $36.23 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Front Oxygen Sensor
- Position: Front
- Replaces: 3S4Z-9F472-CA, 3S4Z-9F472-CC, DY-1031, DY-990
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004-2007 Ford Focus | LX, S, SE, SE Wagon, SEL, Series 25, SES, ST, SVT 3 Door, SVT 5 Door, ZTS, ZTW, ZX3, ZX4, ZX4 ST, ZX5, ZXW | 2.0L L4, 2.3L L4, 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
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Ford Focus Oxygen Sensor, Rear Part Number: F1FZ-9G444-A
$60.00 MSRP: $98.73
You Save: $38.73 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Rear Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2015-2018 Ford Focus | SE | 3 Cyl 1.0 L GAS
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Ford Focus Oxygen Sensor, Rear Part Number: CM5Z-9G444-A
$75.80 MSRP: $124.73
You Save: $48.93 (40%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Rear Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2013-2018 Ford Focus | ST | 4 Cyl 2.0 L GAS
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Ford Focus Oxygen Sensor, Front Passenger Side Part Number: F1FZ-9F472-A
$88.62 MSRP: $145.82
You Save: $57.20 (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
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2015-2018 Ford Focus | SE | 3 Cyl 1.0 L GAS
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Ford Focus Oxygen Sensor, Front Part Number: BA5Z-9F472-A
$89.95 MSRP: $148.00
You Save: $58.05 (40%)
Ships in 1-2 Business Days
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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:
- 2013-2018 Ford Focus | ST | 4 Cyl 2.0 L GAS
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Ford Focus Oxygen Sensor, Front Part Number: FV4Z-9F472-A
$156.91 MSRP: $258.18
You Save: $101.27 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front; Wideband Air/Fuel Sensor; Front Oxygen Sensor
- Position: Front
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2016-2018 Ford Focus | RS | 4 Cyl 2.3 L GAS
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Ford Focus Oxygen Sensor, Rear Part Number: CV6Z-9G444-A
$44.54 MSRP: $70.73
You Save: $26.19 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Rear Oxygen Sensor
- Manufacturer Note: Rear
- Position: Rear
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2012-2018 Ford Focus | S, SE, SEL, Titanium | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
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Ford Focus Oxygen Sensor, Center Passenger Side Part Number: 5S4Z-9G444-BA
$49.69 MSRP: $78.91
You Save: $29.22 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Center, Rear; Rear Oxygen Sensor
- Position: Passenger Side
- Replaces: 3S4Z-9G444-AA, 5S4Z-9G444-DA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2003-2011 Ford Focus | LX, S, SE, SE Wagon, SEL, Series 25, SES, ST, SVT 3 Door, SVT 5 Door, ZTS, ZTW, ZX3, ZX4, ZX4 ST, ZX5, ZXW | 2.0L L4, 2.3L L4, 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
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Ford Focus Oxygen Sensor, Front Part Number: 3S4Z-9F472-DA
$131.50 MSRP: $216.36
You Save: $84.86 (40%)
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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2008-2011 Ford Focus | S, SE, SEL, SES | 4 Cyl 2.0 L GAS
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Ford Focus 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:
- 2012 Ford Focus | S, SE, SEL, Titanium | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
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Ford Focus Oxygen Sensor, Rear Part Number: FB5Z-9G444-C
$65.71 MSRP: $106.00
You Save: $40.29 (39%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Rear Oxygen Sensor; Lower Oxygen Sensor
- Position: Rear
- Replaces: DY-1602, DY-1338, FB5Z-9G444-B, FB5Z-9G444-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2016-2018 Ford Focus | Electric, RS, RS Version, Series 20, SERIES 32, Series 40, Series 70, Series 75, Series 80, ST, ST-Line, Titanium Econetic, Trend Econetic, ZTW | 2.3L L4, 4 Cyl 2.3 L GAS
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Ford Focus Rear Oxygen Sensor, Driver Side Part Number: 1R3Z-9G444-CA
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Oxygen Sensor
- Manufacturer Note: Located in pipe of the bottom of converter. Dark gray connector., PZEV
- Position: Driver Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2003-2004 Ford Focus | LX, SE, ZTS, ZTW, ZX3, ZX5 | 4 Cyl 2.3 L GAS
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Ford Focus Oxygen Sensor Part Number: XS2Z-9G444-AA
Product Specifications
- Other Name: Sensor Assembly; Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2000-2007 Ford Focus | LX, S, SE, SES, SVT, Sony Limited Edition, ZTS, ZTW, ZX3, ZX4, ZX5, ZXW | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
View related parts
Ford Focus Oxygen Sensor, Rear Part Number: F1FZ-9G444-H
$70.30 MSRP: $111.64
You Save: $41.34 (38%)
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Rear Oxygen Sensor
- Position: Rear
- Replaces: DY-1453, F1FZ-9G444-E
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2017-2018 Ford Focus | Electric, S, SE, SEL, ST, Titamium | 1.0L L3, 3 Cyl 1.0 L GAS
View related parts
Ford Focus Rear Oxygen Sensor, Driver Side Part Number: 5S4Z-9G444-CA
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Rear; Oxygen Sensor
- Position: Driver Side
- Replaces: 5S4Z-9G444-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2007 Ford Focus | LX, S, SE, SE Wagon, SEL, Series 25, SES, ST, SVT 3 Door, SVT 5 Door, ZTS, ZTW, ZX3, ZX4, ZX4 ST, ZX5, ZXW | 2.0L L4, 2.3L L4, 4 Cyl 2.3 L GAS

Ford Focus 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 Focus parts. We keep a wide inventory of OEM Focus 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 Ford Focus Oxygen Sensor sends a fluctuating voltage to the engine control computer that varies depending on the amount of oxygen in the exhaust gases versus the atmospheric amount of oxygen. The sensor measures the difference and indicates whether the air fuel mixture is rich or lean. The Oxygen Sensor contains a zirconium dioxide element, which is covered with platinum and encased in ceramic. It is surrounded by a threaded steel shell having openings for exposure of the sensing tip to the gas. The Oxygen Sensor features an integrated heater that rapidly elevates the working temperature to roughly 600°F, enabling the initiation of closed-loop control shortly after startup. The computer interprets high voltage signals up to 0.9 volts as an indication of a rich mixture and low voltage signals near 0.1 volts as an appearance of a lean mixture. It then alters the injector pulse width so that a balanced mixture enters the catalytic converter whereupon it can work effectively and limit emissions. The Oxygen Sensor voltage constantly fluctuates between the two voltages signaling rich and lean mixtures. A mixture feedback is provided by an upstream Ford Focus sensor located before the converter while a catalyst monitor is provided by the downstream Focus sensor after the converter. If contamination occurs to the Ford unit by silicates, silicone, phosphorus, or carbon, response slows, an emissions code can be stored, and the Ford Focus will run rich until the Oxygen Sensor is replaced.

Ford Focus Oxygen Sensor Parts and Q&A

Oxygen Sensor, Rear Driver Side
GU2Z-9G444-A
Q: How to Service and Repair Oxygen Sensor on Ford Focus?
A:
The first step for repairing or servicing the Heated Oxygen Sensor (HO2S) consists of placing the vehicle on a hoist platform with the transmission set to neutral. Disconnect the battery ground cable. The service on HO2S requires disconnecting power connectors from equipment with secondary air injection while detaching wiring retainers and removing the EVAP purging valve heat shield. Reinstall the heat shield through snapping after completing the installation. You should unfasten the exhaust manifold heat shield by removing its four bolts before placing it away so you can reinstall with a torque of 11 Nm (8 lb-ft). Use penetrating and lock lubricant on the HO2S before using a 22 mm crows foot wrench to remove it while tightening to 48 Nm (35 lb-ft) when installing the sensor. Unsnap the electrical connector heat shield from vehicles without secondary air injection before disconnecting the electrical connector and detaching the wiring retainer. For smooth removal of the HO2S apply lubrication if needed before using the 22 mm crows foot wrench in a manner where you tighten it to 48 Nm (35 lb-ft) upon completion. After positioning the sensor wiring correctly around hot surfaces and away from edges, make sure that all retainers secure it and that the electrical connector locking tab is firmly engaged. Users should coat the threaded sections of professionals sensors with anti-seize lubricant before sensor installation. The reverse process should then be used to finish the installation.