Just curious how long you can expect the front O2 sensor to hold up from the leaded gas? It seems everyone is using it and nobody is complaining about it screwing up their sensor. Am I missing something? If you are replacing it, how much does it cost? Thanks.

 

bump Anyone?

 

It will screw up both the front and rear O2 sensor, and destroy the cat if you have one still on the car. You can pretty much run the leaded for race days as long as you don't mind changing the O2 sensors about once a year. I'm not sure what they cost any more.

Another option if you are like me and run a cat on the steet and take it off for the track is swap in your already crapped up sensors for track events and then put the good sensors back in after you have gotten all the leaded fuel out of the car. Not a good idea if you are doing A/F data logging though, as the sensor becomes more lead poisoned response time goes way down and accuracy suffers.

Keith