2000 Honda Accord EGR valve

Engine Mechanical problem
2000 Honda Accord 4 cyl Front Wheel Drive 147000 miles

my uk honda accord eml has come on again, the last time I checked this on a reader was the egr valve stuck, this is my second egr valve and the same code has come on again, the carbon is thicker coated on the bottom of the valve this time..I was told to remove the manifolfd to remove carbon? Is this the inlet manifold? I was also told it might be the engine oil im using.I use 10-40 engine oil. Otherwise I hav had no probs with this car in the 6yrs I have owned it.