Flat Turbo boost sensor This is a sensor located toward th rear of the motor that senses boost. A common sign that this sensor is bad is an extreme loss of power. If this is bad, your truck will set a code.1998.5 1999 and some 2000 have the round connector . This will not work on a late 2000 2001 or a 2002, you need the flat connector as shown. Be sure to look and make sure which connector your truck has.