Already tried the defoulers, our O2 sensors are two big (the sensor itself) to fit in the drilled out defouler. I tried it myself, no dice, so I ordered ones from Strup (straight ones). They fit fine but I am still getting a cel after about 500 miles. I took one of the defoulers that I didn't drill out and filled it with steel wool and then screwed the Strup one into it, followed by installing it into the TP. Works for about 500 miles like I said earlier, but it (cel) still always comes on. I don't know if angled ones will work better, but that is what I tried.
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