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Mazda 2.5L v-6 OBD2 p0400
Posted to Technical Tips Forum on 3/12/2003 5 Replies

My personnel subject car was a 1998 Millenia 2.5 v-6 but this advise goes back at least until 1996 models.

If you get an EGR flow code P0400 on one of these start with this quick test.

Hook a vacuum gauge up to the intake, easy spot is the vacuum port for ... Login to read more.

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