When you looked underneath, did you see the manifolds, and if so did they look like #1 and 2?
If so, then the sensor should be #26 which is 986-606-127-01. Best practice is to replace in pairs (either the pre-cat sensors or post-cat).
The M96.20 is the 2.5 from the 1997-1999 models.
Boxster
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Hybrid Mode
