Where are the O2 sensors on a 1994 Toyota pickup?

On a 1994 Toyota pickup, the O2 sensors are located in the exhaust system. There are typically two sensors: one positioned before the catalytic converter (upstream) and another after it (downstream). The upstream sensor monitors the air-fuel mixture, while the downstream sensor checks the efficiency of the catalytic converter. Accessing these sensors usually requires lifting the vehicle for better visibility and reach.