Is this a normal evo o2 sensor set up?
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Not a stock setup as other have stated. Sensor on right looks like the stock sensor, and the one on the left looks like a wideband plugged into a bung someone home welded. Get a spark plug non fouler or maybe two and screw them into one another, I drilled mine out to have a higher diameter flow too, because I kept throwing codes even after spacing it. Been going strong for over a year now CEL free.


