Subaru Catalytic Converter Replacement Cost
Replace front (or rear) catalytic converter to clear P0420.
$900–$2,200national average
Parts
$500–$1500
Labor
2–4 hrs
DIY-friendly?
No
Why this fails
Coolant intrusion from head gasket, oil burning, or unburned fuel destroys the catalyst substrate.
What the job involves
- Diagnose with O2 sensor data
- Cut/unbolt converter, install new unit
- Replace upstream + downstream O2 sensors
- Clear codes and verify monitor
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If you delay this repair
Failed inspection in 38 states; reduced fuel economy and power.
Save money
- • Aftermarket CARB-compliant cats ~$200-400 vs $1200 OEM
- • Fix upstream cause first (head gasket/oil burn) or new cat fails again
- • Magnaflow direct-fit is the popular budget option
FAQ
How much does subaru catalytic converter replacement cost cost in 2026?
Expect $900–$2,200 at most US shops, parts plus labor.
How long does the job take?
2–4 labor hours typically.
Can I do this myself?
Not recommended for most DIYers; specialized tools or shop equipment usually required.
What happens if I delay?
Failed inspection in 38 states; reduced fuel economy and power.