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Code

P0430

Emissions

Catalyst efficiency below threshold — Bank 2

The bank 2 catalyst is below efficiency threshold.

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Most likely causes

Worn catalyst
O2 sensor issue
Exhaust leak

Symptoms you may notice

Check engine light
Failed emission test

Checks to run

Compare O2 waveforms
Check for leaks
Fix misfires first

Tools you may need

OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

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