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The answer posted previously seems to be taken verbatim from this site, and probably copyrighted there:

Mazda EGR Flow: Low or Excessive?

and if that doesn't work, there are additional tips here:

P0402 EGR code Help - Automotive Message Forums

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โˆ™ 2007-12-24 04:55:26
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Q: Why does the engine light keep coming on indicating code PO402 excessive EGR flow detected in a 2000 Mazda protege after the egr valve and EGR booster sensor were replaced?
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