Where is the bank 1 sensor 1 on 1999 Honda crv to replace heated oxygen sensor?

On a 1999 Honda CR-V, the Bank 1 Sensor 1 (Oxygen Sensor) is located in the exhaust manifold, before the catalytic converter. To replace it, you'll need to access the underside of the vehicle or the engine bay, where the sensor screws into the exhaust system. Make sure to disconnect the electrical connector before removing the old sensor and install the new one securely.