Anyone ever cleaned or replaced their EGR valve? I failed my emissions and can't get a stupid GA tag until I pass. I passed every test with flying colors, except for the NOx ppm test. On the 25/25 test, it ran 1835 and allows 945. On the 50/15 test, it ran 1893 and allows 1045. The guy at the place said he wasn't a mechanic, but it's usually the EGR valve or cat from what he's been told. My friend said if I just try to clean my EGR valve I might be able to pass. Anyone know anything about this Nox reading or how to fix it? I greatly appreciate any help!!!!!!!!!