Unfortunately sometimes there is nothing wron with the system, but the ECU continues to generate codes. I went through this about a year ago with a 90 300SEL. I kept getting several codes. I checked the system thorougly and had to replace the ECU to get rid of some of the codes. I then had to replace the MAS unit to clear the rest of the codes. I'm at home now so I don't have my books. I'll look your system up later today.

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