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P0402 Exhaust Gas Recirculation Flow Excessive Detected | EGR Valve

TOYOTA P0420 OFF catalyst emulator O2 OXYGEN SENSOR ALTERNATIVE Auto

2GR-FKS (ENGINE CONTROL): SFI SYSTEM: P042000,P043000; Catalyst System

P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1) - In

Replacing G28 Engine Speed Sensor on Common Rail (CBEA CJAA) – Diesel
Help! CEL codes p0045 and p0047 boost pressure control valve/solenoid
[XD] - P0420 code and O2 Sensor replacement | Hyundai Elantra Forum