Saturn Astra P2096 and P0420 Diagnostic Codes: Causes and Solutions

The vehicle has been reported with diagnostic trouble codes P2096 and P0420. The only observed symptom is the engine stalling during idle after a brief period of operation. These codes indicate issues related to exhaust system performance and oxygen sensor feedback, specifically a fuel trim malfunction and catalytic converter efficiency problems. While no other symptoms are present, this combination suggests potential misfires or poor exhaust flow that may lead to increased emissions and reduced engine performance.