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Mazda 3 P0401: Meaning, Causes, How to Fix | Drivetrain Resource

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Mazda 3 P0401: Meaning, Causes, How to Fix | Drivetrain Resource

P0401 is a very common OBDII trouble code that'll pop up in the Mazda 3. It has to do with the emissions system and stands for Exhaust Gas Recirculation (EGR)→ Insufficient Flow. The EGR system in your car is responsible for recirculating exhaust gasses in order to lower the vehicle's emissions output. There are three

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