Catalytic Converter: lifespan, maintenance and replacement

Typical lifespan: 70,000–100,000 miles.

Maintenance schedule

• Monitor for check engine light codes — Ongoing

Signs it needs replacing

• Check engine light with catalyst codes
• Rotten egg smell from exhaust
• Failed emissions test
• Reduced engine performance
• Rattling noise underneath

Tips

Catalytic converters contain precious metals and are expensive. Protect against theft with a cat shield.