The product is a Bosch downstream oxygen sensor with the manufacturer part number 15914, designed for use in a 2004-2009 Mazda 3. It is a single unit and comes with the SKU 551:15914. This oxygen sensor is a crucial component of the exhaust and emission system in a car, helping to monitor and optimize the air-fuel ratio for efficient engine performance. With Bosch being a reputable brand known for quality automotive parts, this sensor is likely to provide reliable performance in maintaining the vehicle's emissions control system.....