How many oxygen sensors does a 2003 Honda Accord 2.4 liter have?

The 2003 Honda Accord LX 2.4L has four oxygen sensors. Sensors 1 and 2 are located in the exhaust manifold. Sensor 1, also called the upstream sensor, is about 6 to 8 inches downstream from the exhaust manifold. Sensor 2, the downstream sensor, is located about 6 inches farther down from sensor 1. Sensors 3 and 4 are located in the catalytic converter, in the same manner as sensors 1 and 2.