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Where is the oxygen sensor on a 2002 Toyota Corolla?

There are two oxygen sensors on a 2002 Toyota Corolla:

1. Upstream Oxygen Sensor:

- Located in the exhaust manifold.

- It monitors the oxygen content in the exhaust gas before the catalytic converter.

2. Downstream Oxygen Sensor:

- Located in the exhaust pipe after the catalytic converter.

- It ensures the catalytic converter is operating correctly and helps maintain optimal emission control.

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