I recently got the Check Engine light on my C280 and took it in to the shop I usually go to and had it read. He didnt give me the code but said it was common for the switch-over valve to cause the EGR valve error and that he would reccomend changing that first, if the CE light came on after replacing the switch-over valve then the EGR valve would be replaced. Does this sound like the correct way to approch it? Also, since I'm starting to do a little more of the DIY work, is the switch over valve something I can do on my own?

Thanks

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1986 190E 186K (For Sale)
(Maroon, Tan leather)
1996 C280 Sport 208K
(Brilliant Silver, Black Leather)
2002 CLK430 Sport 45K
(Brilliant Silver, Gray Leather , Birdseye Maple)