O2 Sensor Simulator?
And before I get some internet warriors in here telling me that they have had X and it works perfectly for X amount of miles - I don't care. It's a quick and simple fix for a problem that persists with the rears and I have seen plenty of cars/threads to this effect.
Thank you for clarifying that.
Wonder why GM did that?
At any rate I would sooner put $90 towards a tune than sims.



