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It is a manifold differential sensor. It is used for EGR functionality testing. You can shut the CEL off in DSMLink. Even on a non DSMLink link 2G you can can remove it and it will throw a CEL, but it will not cause any problems. With the DSMLink, you can use the wires that originally ran to it and hook up a real 3 bar MAP sensor up to it and use it to datalog boost. Also, if you hook a real MAP sensor up to its wiring, then it can be used by DSMLink V2 to do the interpolated speed density to avoid MAS overrun.
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