16518moderate severityPowertrain
O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1
on 2017 Audi S5 3.0L Supercharged V6 · AWD
What this code means
The upstream oxygen sensor on bank 1 is not sending a changing signal to the ECU (equivalent to OBD P0134). This usually means a dead sensor or a wiring/heater issue.
Symptoms
- Check engine light on
- Poor fuel economy
- Rough or uneven idle
Common causes
- Faulty O2 sensor
- Broken sensor wiring or connector
- Blown sensor heater fuse
- Exhaust leak near sensor
Diagnostic steps
- Scan for stored codes and freeze frame
- Check O2 sensor signal with scope or live data
- Inspect wiring and connector for damage
- Replace O2 sensor if unresponsive
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