P2200high severityPowertrain
NOx Sensor Circuit Bank 1
on 1997 Mazda Protege 1.5L I4 · FWD
What this code means
Malfunction in the NOx sensor circuit on bank 1. Sensor may not be providing accurate readings.
Symptoms
- Check engine light
- Failed emissions
- SCR system may deactivate
Common causes
- Failed NOx sensor
- Wiring damage
- Connector corrosion
- ECM fault
Diagnostic steps
- Check NOx sensor connector
- Measure heater circuit
- Monitor sensor output with scan tool
Repair notes
Replace NOx sensor bank 1. Verify wiring integrity first.
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