P2416moderate severityPowertrain
O2 Sensor Signals Swapped Bank 1 Sensor 2 / Bank 2 Sensor 3
on 2003 Audi A6 3.0L V6 · AWD
What this code means
The controller detected that oxygen sensor signals appear crossed or swapped between Bank 1 Sensor 2 and Bank 2 Sensor 3. This usually means the sensors are wired to the wrong locations.
Symptoms
- Check engine light on
- Poor fuel economy
- Failed emissions test
Common causes
- O2 sensor connectors swapped during service
- Wiring harness crossed or miswired
- Faulty oxygen sensor
- Corroded sensor connectors
Diagnostic steps
- Verify each O2 sensor is connected to correct location
- Inspect wiring harness routing and connectors
- Compare sensor readings with scan tool
- Repair miswiring or replace faulty sensor
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