Vacuum is present at the switchover and diverter valves. However, the Check Engine Light (CEL) comes on about 24 hours after the code is pulled and reset. I have two 300CE's of the same year and they sound the same on start up (air pump noise), but for some reason, the one in question keeps setting code (11).

I don't really want to do this, but one thought I have is to maybe swap switchover valves (from car to car) to see if the code appears on the other one.

Is there something else I should check?

Thanks for the help!

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1992 300CE - 157kMi (my white beauty)
1992 300CE - 220kMi (sold)
1990 300E - 189kMi (sold)
1990 300SL - 102kMi (salvaged parts available)
1986 300E - 230kMi (salvaged parts available)

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