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P0402 P0402 Code — EGR Flow Excessive Detected (Causes & How to Fix) P0411 P0411 Code — Secondary Air Injection System Incorrect Flow (Causes & How to Fix) P0420 P0420 Code — Catalyst System Efficiency Below Threshold (Causes & How to Fix) P0451 P0451 Code — EVAP Pressure Sensor Range/Performance (Causes & How to Fix)