The 2010 Toyota Prius will have two oxygen sensors and the two of them will be situated in the engine of the vehicle. First press the delivery switch inside the vehicle and afterward head to the outside. Presently utilize one hand to lift the hood and the other to do the wellbeing hook. When You can see the motor currently found the exhaust system and there will be one on each side. These are the main oxygen sensors on the vehicle. In the event that You want to supplant a sensor they will cost somewhere in the range of $15 and $40 each or somewhere in the range of $30 and $60 for a couple.