how do i know wich o2 sensor to replace and if its actually bad for a 91 toyota pickup

Question

My 91 toyota pickup v6 4x4 has all the classic symptoms of a bad o2 sensor, what is the easiest way and cheapest way to tell wich sensor is bad, is there more then one? And how do I tell for sure that these problems are for sure an o2 sensor?

Answer 1

Is your engine light on? any emissions system sensor will throw the mil on and store a current code get the codes pulled (most chain stores do it for free) on a V6 you should have a bank 1 and bank 2 sensor dont be surprised if an insufficient catylst code is pulled as well if the catalytic converter is plugged up or all the catalyst is gone the vehicle will not run properly either.