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.
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 11 and oxygen sensor jack, bank 1, pin 3
DME control module connector II, pin 17 and oxygen sensor jack, bank 1, pin 4
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.