Where are the oxygen sensors located on a 2004 Toyota Matrix?

On a 2004 Toyota Matrix, the oxygen sensors are located in two main areas: one upstream (pre-catalytic converter) and one downstream (post-catalytic converter). The upstream sensor is typically found on the exhaust manifold, while the downstream sensor is located on the exhaust pipe after the catalytic converter. Both sensors play a crucial role in monitoring and regulating the vehicle's emissions and fuel efficiency.