How to Service Oxygen Sensors on 2009 Ford Focus?

Service of the Heated Oxygen Sensor (HO2S) begins with disconnecting the electrical connector after removing the wiring retainer. The use of penetrating and lock lubricant with thread application will help remove the sensor. A technician should employ the Exhaust Gas Oxygen Sensor Socket when removing the HO2S. Set the torque wrench properly then use it to tighten the sensor to 48 Nm (35 lb-ft) when installing. The sensor wires must follow paths that keep them safe from heat sources and metal edges to avoid damage. A thin layer of anti-seize lubricant should be applied to HO2S threads before engaging the electrical connector locking tab. Close the automotive task by following the reverse order of the removal process.

OEM 2009 Ford Focus Oxygen Sensors

Oxygen O2 Sensor

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2 Oxygen Sensors found

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2009 Ford Focus Oxygen Sensor, Front Part Number: 3S4Z-9F472-DA
$106.30 MSRP: $174.91
You Save: $68.61 (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
- Base No.: 9F472
- Item Weight: 0.50 Pounds
- Item Dimensions: 8.4 x 7.7 x 7.6 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 3S4Z-9F472-DA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
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Fits the following 2009 Ford Focus Submodels:
- S, SE, SEL, SES | 4 Cyl 2.0 L GAS
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2009 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
ADD TO CART
Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Center, Rear; Rear Oxygen Sensor
- Position: Center Passenger Side
- Replaces: 3S4Z-9G444-AA, 5S4Z-9G444-DA
- Base No.: 9G444A
- Item Weight: 0.50 Pounds
- Item Dimensions: 8.6 x 7.7 x 7.9 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 5S4Z-9G444-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
More Info
Fits the following 2009 Ford Focus Submodels:
- LX, S, SE, SEL, SES, ST, ZTS, ZTW, ZX3, ZX4 ST, ZX5 | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS

2009 Ford Focus Oxygen Sensors

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2009 Ford Focus Oxygen Sensors Parts Q&A

Q: How to Service Oxygen Sensors on 2009 Ford Focus?
A: Service of the Heated Oxygen Sensor (HO2S) begins with disconnecting the electrical connector after removing the wiring retainer. The use of penetrating and lock lubricant with thread application will help remove the sensor. A technician should employ the Exhaust Gas Oxygen Sensor Socket when removing the HO2S. Set the torque wrench properly then use it to tighten the sensor to 48 Nm (35 lb-ft) when installing. The sensor wires must follow paths that keep them safe from heat sources and metal edges to avoid damage. A thin layer of anti-seize lubricant should be applied to HO2S threads before engaging the electrical connector locking tab. Close the automotive task by following the reverse order of the removal process.