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couldnt tell ya for sure, but having a MAP bypass on my car, i know that from reading the instructions on the little box that it says the little mesh filter inside the bypass valve occasionally needs to be changed as it wears down. mine came with enough paper mesh/filter shit for 4 usages..if you know what im talking about, try just removing the old shit and replacing with new.

if its worn down and has holes in it, your sensor is going to sense some of that boost(especially at higher boost levels like you described) and illuminate your MIL and make you run richer.
 
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