Subaru WRX Downstream Oxygen (O2) Sensor
$149.99
The downstream oxygen sensor sits after the catalytic converter and checks how efficiently the cat is scrubbing emissions. When it degrades, you'll often see a check engine light for catalyst efficiency, or a slight dip in overall drivability.
Designed to match the Subaru WRX 2.0L Turbo FA20 engine layout, this sensor installs in the factory downstream location with the correct thread pitch and connector for a straightforward swap.
Made to direct-replacement standards, it delivers reliable post-catalyst readings so your emissions system and ECU stay in sync.
Reference: OE/interchange WALKER
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FAQ
What is the purpose of the downstream oxygen sensor in a Subaru WRX?
The downstream oxygen sensor sits after the catalytic converter and checks how efficiently the cat is scrubbing emissions. When it degrades, you'll often see a check engine light for catalyst efficiency, or a slight dip in overall drivability.
What tools and materials are needed to replace the oxygen sensor in a Subaru WRX?
To get started, gather the following tools and materials: - Subaru WRX Downstream Oxygen (O2) Sensor from Humbl: [Subaru WRX Downstream Oxygen (O2) Sensor](https://www.humbl.online/product-page/a-subaru-wrx-downstream-oxygen-o2-sensor) - 10mm socket - 14mm socket - Allen wrench (for the oxygen sensor connector) - Jack and floor jack - Protective eye wear - Gloves - Rags
How do you replace the oxygen sensor in a Subaru WRX?
Once you have your tools and the correct oxygen sensor, follow these steps: 1. Lift your Subaru WRX using a floor jack and secure it with jack stands. 2. Locate the oxygen sensor on the exhaust pipe, just after the catalytic converter. You'll need to remove the heat shield to access it. 3. Disconnect the electrical connector from the oxygen sensor. Use your Allen wrench to loosen the connector if it's stubborn. 4. Unthread the oxygen sensor using your 14mm socket. 5. Remove the old oxygen sensor and replace it with the new Subaru WRX Downstream Oxygen (O2) Sensor from Humbl. Hand-tighten the sensor into place. 6. Reconnect the electrical connector, and ensure it's secure. 7. Reinstall the heat shield and lower your WRX. 8. Turn on your car and check for any check engine lights or unusual noises. If all is well, your oxygen sensor replacement is complete.
Where can I find more information about the Subaru WRX Downstream Oxygen (O2) Sensor?
For more information on the Subaru WRX Downstream Oxygen (O2) Sensor or other high-quality parts for your Subaru, visit [Humbl](https://www.humbl.online) online today.
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