Where is the heater oxygen sensor bank 1 sensor 1 located on a 1999 Honda civic dx 1.6L?

The bank 1 sensor is located front and center on your engine. It looks somewhat like a spark plug. It has 3 wires leading into it from a wiring harness located about 12 inches to the left of the sensor. It is at the top,front of the engine,partially covered by your exhaust shroud.