What should the O2 sensor readings be in TunerCat? I was in open loop (haven't gotten to closed yet) and one said about 400 and the other to the right of it said about 150.

 

i havn't use tunercat in months now, but from what I remember, it shouldn't say anything...

Do you mean some other logging program? Like Datamaster or Freescan? If so, they should be fluctuating rapidly once the car is warmed up... and if they are not, its probably safe to say they are toast

Hopefully more people will chime in...

 

They may have been warming up still.

open loop and our O2's are really tricky items. Except at 14.7 and nice and hot, they will read wrong. Even a change to 14.6 or 14.8 will throw them off by 150 mv or more. If you were seeing it constantly around 400 and 150 they are dead. If they are warming up, they will keep going down in mv until they are hot Takes a few minutes.

 

Yeah, sorry I meant DataMaster... hopefully they were just warming up. I thought they should be close to the same though.