P2201high severityPowertrain
NOx Sensor Circuit Range/Performance Bank 1
on 2009 Audi R8 5.2L V10 (Gen 1, 525hp) · AWD
What this code means
NOx sensor on bank 1 is responding but values are outside expected range.
Symptoms
- Check engine light
- Poor emissions performance
- Possible SCR fault codes
Common causes
- Degraded NOx sensor
- Exhaust leak near sensor
- Contaminated sensor element
Diagnostic steps
- Compare actual NOx levels to expected at various loads
- Check for exhaust leaks
- Inspect sensor condition
Repair notes
Replace NOx sensor if out of specification after leak check.
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