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It should be on the upper left side of the firewall. There is typically a single vacuum line running to it, along with one electrical connection. Most Mazda EGR boost sensors are made by Hitachi, so if it is the original boost senor, it should say Hitachi on it somewhere. If you follow the EGR lines around, you should find it eventually. By the way, EGR boost senor issues are a common problem on all Mazda's made around this time and a dealer should know how to fix it.
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