natgwil

So the EML light came on and when I checked the error code it was 19586 - "EGR System: Regulation Range Exceeded". Following advice read on this forum I removed the EGR valve and cleaned it thoroughly. I cleared the fault code. After a few miles of city driving the EML comes back on, and the code is there again. I have cleared it a couple of times but it keeps coming back. On a longer motorway trip it took about forty miles to come back. But driving around the city it takes only a couple of miles. So my question is do I need a new EGR valve or is there anything else I should try first? Thanks in advance for your help.