# P0430 — Catalyst System Efficiency Below Threshold (Bank 2)

> ClearTheCode diagnostic code reference (not OEM service data).

Source: https://clearthecode.com/codes/P0430

**System:** Powertrain · Catalyst System

**Severity:** moderate

## Description

Same as P0420 but on Bank 2. Replace the Bank-2 catalytic converter after verifying with downstream sensor.

## Diagnostic snapshot

- **Difficulty:** 6/10 — Intermediate diagnostics
- **Est. repair cost:** $120 – $450

## Diagnostic workflow

1. Confirm P0430 with a live scan — note pending vs stored and freeze frame data.
2. Inspect wiring/connectors and related sensors before replacing modules.
3. Clear codes and road-test; re-scan after two drive cycles if the monitor must set.

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