Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Porsche Boxster Base, AutomaticFACTORY OEM SERVICE PROCEDURE
O2 Sensor Circuit No Activity Detected
Diagnostic conditions
- Exhaust temperature between 250°C and 750°C
- Battery positive voltage between 10 V and 16 V
- Time elapsed after engine start-up greater than 200 seconds
- Oxygen sensor heating switched on for at least 120 seconds
Possible cause of fault
- Loose contact or corrosion in connector
- Open circuit in the oxygen sensor signal wire
- Open circuit in the oxygen sensor ground wire
- Oxygen sensor faulty
- DME control module faulty
Affected terminals
DME control module connector II, pin 8 and oxygen sensor jack, bank 2, pin 3
DME control module connector II, pin 14 and oxygen sensor jack, bank 2, pin 4
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.