C30 Engine : 2008 C30 1.6D EGR valve

[Tombobrown]

Hello there,

This is my first post, having lurked on this site for a little while.

I've had a 2008 c30 1.6D R-Design for about 18 months now. recently it had been popping up an engine warning light on the dash, with the following codes:

P1412: EGR Different.Pressure Sensor Signal too Low
P2458: Diesel Particulate Filter Regeneration Duration (not worried about this one)
P0490: Exhaust Gas Recirculation Control Circuit A High

Following advice on some of the other post on this site, I took the EGR valve out and cleaned the mechanism with carb cleaner until I could operate the valve easily with my fingers. It was very sooty, but before cleaning I could still open and close the valve before cleaning. I also noticed that the valve gasket wasn't sealing fully, as one bolt was loose and the gasket was sooty on one side.
After refitting the cleaned gasket I ran my car for the weekend and got the same light on the dash with this same code as before:
P1412: EGR Different.Pressure Sensor Signal too Low

At this point I figured that the valve must be faulty, so I opted to replace it. I bought this replacement valve from amazon which I fitted on saturday: https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1
At first this seemed to fix everything, but this morning I had an "anti skid system service required" warning light, with these codes:
P0490: Exhaust Gas Recirculation Control Circuit A High
P2458: Diesel Particulate Filter Regeneration Duration (not worried about this one)
P1402: EGR Valve Circ Short to B+

Any ideas would be great. I'm wondering if I've bought a faulty valve from amazon. It was cheaper than the alternative from eurocarparts.com

Any help Is appreciated,

Tom