Check engine light came on went to autoparts store to have it check bad EGR he said was told to just clean it, Are there any pictures on here showing how to change the EGR Valve? I check and didnt find any. 1998 ML320

 

One bolt holds it onto the block,unbolt it and with a couple of fine drills and scrapers and possibly a carby cleaner clean out the passages, should do the trick.