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go to any auto parts store, and get two 18mm spark plug anti-foulers. you will have to drill one of them out a bit to make the o2 sensor fit. screw to o2s into the anti-fouler, then screw that assembly into the second anti-fouler, then put the whole assembly back onto the car. I have the megan racing header and since I put the anti-fouler on no CEL.
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