OXYGEN SENSOR FITS SUBARU IMPREZA R RS RX XV G3 G12 GH7 2007-2011 4 DOOR 2.0 LITRE F4 16V OX850

Description

The OX850 Oxygen Sensor is listed for selected Subaru Impreza R, RS, RX and XV applications associated with the G3, G12 and GH7 model codes from 2007 to 2011. The supplied fitment details specify a four-door vehicle equipped with a 2.0-litre horizontally opposed four-cylinder (F4) engine featuring 16 valves.

An oxygen sensor is an important part of the vehicle’s engine management and exhaust monitoring systems. It measures the oxygen content in the exhaust gases and sends information to the engine control unit (ECU). The ECU uses this feedback, together with readings from other engine sensors, to help regulate the air-fuel mixture and manage emissions.

When an existing oxygen sensor becomes worn, contaminated or electrically faulty, it may provide inaccurate readings or respond more slowly than intended. Replacing a sensor that has been correctly diagnosed as faulty may help restore appropriate feedback to the engine management system.

The OX850 listing provides a replacement option for buyers maintaining a compatible Subaru Impreza. Since different engine variants, production dates and exhaust configurations may use different sensors, buyers should verify the original equipment part number and exact application before ordering.

Product Specifications

• Product Name: Oxygen Sensor
• Product Code: OX850
• Vehicle Make: Subaru
• Vehicle Model: Impreza R, RS, RX and XV, as listed
• Model Series: G3, G12 and GH7, as supplied
• Model Years: 2007–2011
• Body Style: 4-door
• Engine Capacity: 2.0 litre
• Engine Configuration: Horizontally opposed four-cylinder (F4-boxer)
• Valve Configuration: 16-valve
• Product Function: Exhaust oxygen measurement and engine management feedback
• Sensor Position: Confirm whether an upstream or downstream sensor is required
• Connector Type: Must match the original sensor
• Fitment Verification: Check VIN, engine code and original equipment part number

The specifications above reflect the supplied product listing. Exact compatibility should be confirmed against the vehicle’s individual configuration.

What Does an Oxygen Sensor Do?

An oxygen sensor, also known as a lambda sensor, measures the amount of oxygen present in the exhaust stream. Its signal helps the ECU determine whether combustion is occurring with an appropriate air-fuel mixture.

On a compatible petrol-engine Subaru Impreza, oxygen sensor feedback supports fuel control, combustion management and emissions-system operation. When the sensor operates correctly, it helps the engine management system make adjustments based on changing driving conditions.

Depending on the vehicle’s design, the exhaust system may contain multiple oxygen sensors. An upstream sensor is generally positioned before the catalytic converter and supplies information used for fuel mixture control. A downstream sensor is usually located after the catalytic converter and helps monitor catalytic converter performance.

These sensors are not necessarily interchangeable. They may have different signal characteristics, heating elements, wiring arrangements and connector designs. Selecting the correct location-specific part is therefore essential when replacing a sensor on a Subaru Impreza G3-series vehicle.

Key Features and Benefits

• Exhaust Oxygen Monitoring: Measures oxygen levels in exhaust gases and supplies feedback to the engine management system.
• Engine Management Support: Helps the ECU make appropriate air-fuel mixture adjustments when the sensor is correctly matched and
• functioning properly.
• Emissions System Assistance: Supports the operation of the vehicle’s exhaust monitoring and emissions control systems.
• Replacement for a Faulty Component: Provides a replacement option when diagnostic testing confirms that the existing oxygen sensor is defective.
• Subaru Application Listing: Specified for selected Impreza R, RS, RX and XV applications from 2007 to 2011, subject to fitment confirmation.
• Potential Warning-Light Resolution: Replacing a confirmed faulty sensor may resolve related diagnostic trouble codes, depending on the underlying cause.
• Maintenance Support: Helps vehicle owners address oxygen sensor faults as part of responsible engine and exhaust system maintenance.

Actual results depend on the vehicle’s condition, correct part selection and the nature of the original fault. Replacing an oxygen sensor will not automatically resolve problems caused by unrelated engine or exhaust components.

Common Symptoms of a Faulty Oxygen Sensor

A faulty oxygen sensor may contribute to a range of engine management symptoms. However, these signs can also indicate other problems and should be investigated before replacing parts.

Common symptoms include:

• Illuminated Check Engine Light: The ECU may detect an abnormal sensor signal, heater circuit fault or sensor response issue.
• Increased Fuel Consumption: Incorrect oxygen readings may affect air-fuel mixture control and contribute to higher fuel use.
• Rough or Unstable Idling: Inaccurate sensor feedback may contribute to inconsistent engine operation.
• Hesitation During Acceleration: An engine management issue may affect throttle response or drivability.
• Increased Exhaust Emissions: Incorrect mixture control or another engine fault may cause emissions to rise.
• Failed Emissions Inspection: A sensor fault or related emissions system problem may affect test results.
• Diagnostic Trouble Codes: A scan tool may identify codes relating to oxygen sensor signals, heater operation or system performance.

Not every warning light or drivability problem indicates a defective oxygen sensor. Exhaust leaks, vacuum leaks, ignition problems, fuel delivery faults, damaged wiring and catalytic converter issues can produce similar symptoms.

Why Correct Fitment Matters

Choosing the correct sensor is important because oxygen sensors that look alike may have different electrical and mechanical specifications. Differences in connector shape, wire count, cable length, thread dimensions and sensor response can prevent a part from fitting or operating correctly.

Before purchasing the OX850 for a Subaru Impreza, confirm:

• The vehicle’s VIN and engine identification code.
• The exact model year and variant.
• The original oxygen sensor part number.
• Whether the replacement is for the upstream or downstream position.
• The connector shape and number of wires.
• The sensor’s thread and mounting arrangement.
• The vehicle’s exhaust and emissions configuration.

The model and series names in the listing should be checked against the vehicle’s identification documents and original equipment information. Do not assume that every Impreza R, RS, RX or XV uses the same oxygen sensor.

Installation and Maintenance Recommendations

• Diagnose Before Replacement: Use a suitable diagnostic scanner and inspect sensor data where possible. Confirm that the sensor is the cause of the fault.
• Allow the Exhaust to Cool: Exhaust components can become extremely hot. Ensure the vehicle is safely supported and the relevant parts have cooled before work begins.
• Compare the Parts: Check the replacement against the original sensor, including the connector, wire length, thread and part number.
• Use Appropriate Tools: A suitable oxygen sensor socket can help reduce the risk of damaging the sensor or nearby components.
• Protect the Wiring: Route the cable away from hot exhaust components and moving parts. Avoid twisting or stretching the wires.
• Follow Manufacturer Instructions: Use the specified tightening torque and installation procedure. Apply anti-seize compound only when permitted by the sensor manufacturer.
• Check After Installation: Clear fault codes when appropriate, perform any required drive cycle and check whether the warning light returns.
• Inspect Related Systems: Check for exhaust leaks, wiring damage and engine faults that may have caused the original sensor problem.

If the correct sensor position or installation procedure is uncertain, consult a qualified automotive technician.

Fitment Checklist

Before ordering OX850, verify that your vehicle matches the supplied application details:

• Subaru Impreza R, RS, RX or XV as applicable.
• Model year between 2007 and 2011.
• Four-door body style.
• 2.0-litre F4 boxer engine with 16 valves.
• Correct G3, G12 or GH7 identification where applicable.
• Matching original equipment part number.
• Correct upstream or downstream position.
• Compatible electrical connector and emissions configuration.

Conclusion

The OX850 Oxygen Sensor is listed for selected Subaru Impreza R, RS, RX and XV applications from 2007 to 2011, with a four-door body and 2.0-litre F4 16-valve engine. This component helps monitor exhaust oxygen levels and provides information that supports engine management and emissions control.

If the original sensor has been diagnosed as faulty, a correctly matched replacement may help restore suitable sensor feedback and address related engine management issues. Before ordering, verify the VIN, engine code, original part number, sensor position and connector configuration to help ensure the replacement is suitable for your particular Subaru Impreza.