Mazda Code P0400
- The first character in the P0400 code, "P," stands for powertrain. The "P" indicates that the issue resides in the Mazda's powertrain.
Second and Third Characters
- The second character in this code is "0," which indicates that it is a generic code and not manufacturer-specific. The third character indicates the affected sub-system. In this case, "4" represents the emission control system.
Fourth and Fifth Characters
- The fourth and fifth digits relate to the specific problem. P0400 is an error code for an "Exhaust Gas Recirculation Flow Malfunction." This means that there is some blockage or malfunction within your exhaust system. A professional mechanic will be able to determine the exact nature of the issue once they have the information provided by the P0400 code.