[FED 387]

Eventually leaded gasoline will wreck an O2 sensor---It also depends on if its a carb or EFI system---EVENTUALLY if you are using LEADED fuel it is going to fail ---how soon depends on the tune up if you are close initially it might last longer --OR -it might fail in just a few dyno pulls or it might last a few hours (50-75)--I don't think there is anyway to clean them either--you can try soaking the sensors(completely covered) in gasoline for about 8-12 hours to loosen up any residue and then GENTLY use a soft brush to clean any residue that the gas left on the sensor , then use soft cotton cloth to wipe the tip---might work might not -I could be wrong on all this tho--FED 387