Your car has 4 O2 sensors, bank 1 is the passenger side. The sensor in question is on the passenger's side nearest to the head (before the cat). Check the wiring, if it's good the sensor needs to be replaced.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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