EGR Differential Pressure Sensor Code Again

[rtjohnson1982]

Check Engine light is coming on immediately and staying on and mechanic says the computer code is reading the egr differential pressure sensor is bad but I just replaced with a new Cummins brand one less than 8 months ago. Mechanic originally recommended a new egr which I did. 07’ ISX Any advice would be much appreciated because I’m throwing money away buying parts and the problem is no better.