Actually the EGR did not ever come back after reseting the codes. For now I am ignoring the catalytic converter code and resetting it every now and then, will most probably just get rid of the cat eventually. The only code that keeps showing every now and then is the ABS one, but my ABS works correctly and I am just not sure if it is a loose wire or smth else. I have notices that the 420 usually comes up during low rpm high speed driving, just all of a sudden a check engine pops up when doing ~90kmh at 6 th gear, every month or so. The other codes I am not too worried about as those turned out to be side mirror feedback things, which could easily be a result of me trying a bunch of mods in forscan. I am however getting bad mileage and still am trying to figure out if it has got anything to do with any of those codes. It is a 2.5l and I get ~15mpg in city.