Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2016 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Rear Oxygen Sensor: Removal
- Disconnect the ground terminal from battery sensor. < Ref. to BATTERY , NOTE, Note. >
- Lift up the vehicle.
- Remove the under cover. < Ref. to REMOVAL , Front Under Cover. >
- Disconnect the connector on the rear oxygen sensor from the engine harness.
- Apply spray-type lubricant (004301003) to the threaded portion of rear oxygen sensor, and leave it for one minute or more.
- Remove the rear oxygen sensor.CAUTION: When removing the rear oxygen sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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