How many o2 sensors in a 2001 Toyota tacoma 3.4?

A 2001 Toyota Tacoma with a 3.4L V6 engine typically has four oxygen (O2) sensors: two upstream (pre-catalytic converter) and two downstream (post-catalytic converter). These sensors help monitor the efficiency of the engine's fuel mixture and the catalytic converter's performance. If you're experiencing issues, it's important to check all four sensors for proper function.