Quote:
Originally Posted by SI_kidd18
yah i dont want the smell. whats a defouler? like an air freshener.
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A defouler is a small, section of tubing that screws into the second O2 bung on the header. The O2 sensor is then screwed into the defouler. The defouler removes the O2 sensor away from the exhaust so that the ECU is tricked into thinking that emissions' levels are compliant. The main reason people do it is to avoid a CEL.