MAF, IAT, MAP and Coolant Level Sensor problem all together on Mazda MPV?

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If all this problem started at once together,then its basically loose or defective ground issue.
All this sensors share the same engine wiring harness from the computer (called the PCM) and a common ground circuit, which is referred to as the signal return. So I think you need to look for a defective ground or may be it is bad PCM.Getting this details checked will help.Thanks.
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