Question 1

What does P0430 mean?

Accepted Answer

P0430 - Catalyst System Efficiency Below Threshold (Bank 2). Same as P0420 but for bank 2. The bank 2 catalytic converter isn't efficient enough.

Question 2

What are the symptoms of P0430?

Accepted Answer

Check engine light, No drivability issues, Possible sulfur smell

Question 3

What causes P0430?

Accepted Answer

Degraded catalytic converter, Faulty downstream O2 sensor bank 2, Exhaust leak bank 2, Rich/lean condition, Catalyst contamination

Question 4

How much does it cost to fix P0430?

Accepted Answer

Typical repair cost: $100-$2,500. If P0420 AND P0430 (both banks), an engine condition (rich, misfires, oil consumption) damaged both cats.

P0430 — Catalyst System Efficiency Below Threshold (Bank 2)

Don't guess — diagnose P0430 the right way