P2202moderate severityPowertrain
NOx Sensor Circuit Low Bank 1
on 2004 Subaru Legacy 3.0L H6 · AWD
What this code means
NOx sensor bank 1 signal is below minimum expected voltage.
Symptoms
- Check engine light
- Incorrect DEF injection rate
Common causes
- Sensor short to ground
- Wiring fault
- Failed sensor
Diagnostic steps
- Measure signal voltage
- Check wiring for shorts to ground
Repair notes
Repair wiring or replace NOx sensor.
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