# P0400 on the 1995 Mazda Protege

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0400

- [54218](https://open.wenmarpro.com/bulletins/54218), 1998-03-30: UNDER CERTAIN LOAD AND RPM RANGES EXCESSIVE NOISE MAY BE IN GENERATED IN THE EGR BOOST SENSOR CIRCUIT CAUSING DTC P0400 TO BE SET. \*YC