What Does Code P0430 Mean? P0430 definition: Catalyst system efficiency below threshold (Bank 2). Issue Severity: MODERATE– Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible. Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0430 code. This DTC can … Continue reading P0430 – Meaning, Causes, Symptoms, & Fixes