Last night, I flipped my FJO wideband on and it was pegged on 20:1. This was at idle and I am pretty sure it was a bad reading. Think the sensor is bad??

 

Do you have a exuast leak. I have had a few die on me. It could just be seeing the extra air from the exuast leak.

 

No exhaust leak... sealed tight.

 

Widebands do not cater too well to being left in exhaust pipes while not being used (heated)

The reason it's a 5 wire sensor is that a couple of the wires are for a heating element. Not heated, the sensor will clog up and fail.

Well that would be my general diagnosis.

 

It just sucks how expensive they are!!!

 

I wonder if you burned it up with that exhaust leak you had a while back?

 

Leaded fuel ie. race gas is also hard on the sensors. Don't know if you run any, but high octane race fuel will also burn up the sensors.

 

i think the lead can plug the sensor, not burn it up. i know leaded fuel is not good for them but i probably have 300+ gallons of 118 on my original sensor.

definately not suppose to leave the sensor in if the controler isn't hooked up and running

 

So... Is using the optional guage the only way to keep it running all of the time? Or, does the sensor being hooked up to the control box keep it warm all of the time?

 

you can leave the control box hooked up and it will be running all of the time, you just wont be monitoring it. the other option is to pull the sensor out when you are not using it.