Toyota Tacoma o2 sensors

I need to find the part numbers for (and where to buy) the oxygen sensors for my 1997 Toyota Tacoma 4x4 Auto Reg. Cab, for both in front of and the behind the catalytic converter. Advanced Auto tells me they are the same part. However, on the web I can only find the before sensor.

Can anyone help me?



They are the same part. So any local auto parts store should have these.

The only difference between them is that they serve different functions. The O2 sensor before the cat monitor the oxygen content of the exhaust gas so the engine management system can make adjustments to the fuel mixture. The O2 sensor after the cat monitors the oxygen content of the exhaust gas to determine how efficiently the catalytic converter is operating.