1999 saturn s series 4 cyl. has code po405 already replaced egr valve

Hi. This code has come up for two possible reasons. the actual new egr valve has become clogged by the increasing amount of carbon that has built up in the intake manifold. when replacing th egr valve, its a good rule of thumb to use a cleaning solution to cleanse the hole that the egr valve is inserted in. make sure you clean it thoroughly inside as well. This method is good but, it dosen't always work so, the next level of cleaning the intake is to remove it and clean it manually. the next possible issue could be that the wire connectors are worn. this is highly unusual but, it may be the issue here.


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