Egr valve problem

[Steve1403]

I have a 1.6 diesel focus, it's got a problem with power, its fine at first then after a few miles it stuggles has no go init. i plugged it in and there were 3 codes 2 EGR and 1 for the MAF sensor.

I have changed the MAF sensor and the EGR valve, the MAF code hasn't come back but the power problem is still happening so i plugged it back in and the same 2 EGR vaults codes have come up.

The codes are

 Exhaust gas recirculation (EGA) system -circuit high

Exhaust Gas Recirculation “A” Control Stuck Closed

 

If anyones had this problem or got any advice that would be great