1995 C280 EGR Flow Malf......
 

I just replaced the EGR valve and cleaned the tube that runs into the exhaust manifold. The other that goes around the back of the engine looked clean. Drove the car a few times and the CEL popped back on with the same code P0400 EGR Flow Malf. What else is a common issue with this code and car. I figured a new EGR valve would fix it but it did not. All help is appreciated.

Wiring issue, bad year for electrical wire insulation, it gets brittle and cracks.