how do you know that a 02 sensor is bad or not???
the reason i asked is that the check engine code for the 02 comes and goes....
also i'm running super rich.....
the car has turbo and it has been tuned....

any help well be greatly appreciated.........

thanks

 

any1???

 

what year is your car? it might be throwing a code for running too rich on an obd2 system. list some details of what your setup is

 

what kind of car yr motor obd1 or 2