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O2 sensor before cat is located on the back side of the motor between the firewall and engine. Look there and on the exhaust pipe you'll see a sensor there. Follow the wire and unplug it, then using a 22m O2 sensor socket remove it from the exuaust pipe. This maybe easier when the engine is warm but be careful of the hot exhuast pipes!

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Q: How do you replace the O2 sensor located before cat on a 2001 Toyota Corolla?
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