July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

EGR Valve Lift Sensor

Based upon internal calibrated tables, the PCM calculates and adjusts for ideal EGR valve lifts for varying operating conditions. EGR valve lift sensor detects EGR position and sends the information (actual position) to the PCM. PCM compares this information with operating conditions to determine continued adjustment requirements.