rschenck Posted November 24, 2009 Posted November 24, 2009 I noticed that the after Catalytic O2 sensor on my 2001 RX 300 lost its mounting nuts and fell out of the exhaust. I ordered a replacement, but it did not come with new mounting nuts. I have tried a variety, but I can't seem to find the right size. Does anyone know the size of the bolts on the mounting flange?
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