P0430

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Catalyst Efficiency Below Threshold (Bank 2)

What this code means

Same fault as P0420 but on the second cylinder bank of V6/V8 engines - the catalytic converter on bank 2 is underperforming.

Common symptoms

Check engine light
Slightly worse economy
Possible sulfur smell

Most common causes

Aged catalytic converter
Faulty O2 sensors on bank 2
Exhaust leak
Misfires damaging the catalyst

Can you keep driving?

Safe short term, like P0420 - but find the root cause before investing in a new catalyst.

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Descriptions are for guidance only. Accurate diagnosis requires a workshop inspection.