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Originally Posted by ohioboxster
Actually is there a difference between pre-cat and post cat 02 sensors?
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Nope. The only difference in the original ones is the connector plug on the end of the sensor. If you look up the Bosch universal sensor for Boxsters (about $100 ea) the same part number is for pre and post cats. In fact, any 4-wire sensor that physically matches the screw threads should work fine.