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So heres the before and after with the swapped 02 sensors. When I first started the car it was at 1 volt then it slowly dropped and stabilised around 850 ish, is this normal? Here is a pic of the 02 sensor, before i installed it the first time, it was all covered in black soot. Should've taken a pic of the one I swapped in to compare. Anyways, as you can see, most of the soot has been cleaned/burnt/blasted off. Could that be a sign of anything?
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