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Can be:
bad wiring between O2 sensor and the DME
bad sensor
bad DME.
Check the connector at the sensor and the wiring.
Swap the sensor with the one on the other side to see if the problem moves.
If it does, replace the sensor.
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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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