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.
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
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