Anyone here have their o2 sensors replaced. I'd like to do it myself so any input on how to diy would be appreciated. I was in a hurry and i could'nt check the all data at school thoroughly. Anyone know what to look under in alldata to find the o2 sensor instructions? I've found non oem fronts for $30 and rears for $70. anyone find them for cheaper? my car is still running strong even though a sensor needs to repaired but i can tell its missing a little power especially when the ect/pwr is off. thanks.