Air/Fuel Ratio Gauge question

[johngoodman]

I've had two Bosch O2 sensors go bad on me - at least that's what the code says. I can reset the code, but it eventually comes back. I saw a YouTube video on how to test an O2 sensor IF you have an Air/Fuel Ratio Gauge. I've looked at Summit, AutoZone, etc., and the prices go from $50 to $300. There also seems to be a "sender" that is sometimes required.
If I just want a cheap setup to use on a bench to see if the O2 sensor is good, what do I really need?
John

[cammed goat]

If you want something on the cheap, then you can get an A/F ratio gauge from Summit. I am not familiar with how all 4 sensors are wired, but on my old Chevy Beretta, I tapped into the O2 sensor wire. I don't know if there is one wire to the BCM and then 4 wires coming out.

[35th-ANV-SS]

You can test them with an Ohm meter. http://mr2.com/TEXT/O2_Sensor.html

[35th-ANV-SS]

I would suggest determining what is causing them to go bad. You probably have a vacuum leak, or it's possible that the wiring loom may be hitting the header/exhaust and has burnt through it causing damage.