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Take off the EGR valve (2 bolts and vacume lines) and clean out really good with carb cleaner. Then make sure the two ports in your intake are cleaned out. These tend to get clogged up really bad. It took me a few times to get it all cleaned out but since then have not had any problems with the light coming on. One way to find out if the intake ports are clogged is to remove the EGR and start the car up. If it runs fine then those two ports are clogged.
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