Oxygen Sensor (O2 Sensor): lifespan, maintenance and replacement
Typical lifespan: 60,000–100,000 miles.
Maintenance schedule
- Monitor fuel economy — Ongoing
- Check for related trouble codes — When check engine light appears
Signs it needs replacing
- Check engine light on
- Poor fuel economy
- Rough idle
- Failed emissions test
Tips
Most vehicles have 2–4 O2 sensors. Use an OBD2 scanner to identify which one is failing.