How to Replace Oxygen Sensor on 2001 Toyota Corolla

The oxygen sensor on your Toyota Corolla analyses the exhaust gases in order to tell the ECU what air-fuel mixture adjustments are needed to be performed in real time.
2001 Toyota Corolla Oxygen Sensor 1 photo
Photo: screenshot from Youtube
Replacing a damaged oxygen sensor is almost as simple as replacing a sparkplug, since its shape and mounting style are almost identical. However, this Corolla model needs an adaptor for the oxygen sensor to be mounted on the exhaust system, but don’t worry because it should be provided with the spare sensor. So you will need a 12 mm socket ratchet and an adjustable wrench. Here are the steps:
  • Open up the hood and let the engine cool down
  • Locate the oxygen sensor behind the engine block on the exhaust system
  • Unscrew the two 12 mm nuts of the adapter that is holding it mounted
  • Remove the sensor and unplug its cable
  • Take the new sensor and mount it on the provided adaptor
  • Put the whole assembly in the designated location on the exhaust system
  • Secure it with the two nuts
  • Plug the wires back in.
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