Where is the 02 senor located lancer 2002?

In a 2002 Mitsubishi Lancer, the O2 sensor is typically located in the exhaust system. There are usually two O2 sensors: one is positioned before the catalytic converter (upstream), and the other is after it (downstream). You can find the upstream O2 sensor near the exhaust manifold, while the downstream sensor is located further back in the exhaust pipe, after the catalytic converter.