UPDATE: on the way home from work, CEL came on, code P0120. Here we go again...

Also - in a previous post I said the switchover valve was not replaced previously...checked mechanic records, it was replaced along with both can-style transducers last january. Having said that, one of the parts went bad and I had to take it back soon afterwards - don't recall which part was bad. Everything's been good this spring and summer until just 1-2 weeks ago. Not sure if something went bad again, or leak is somewhere else.

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Charlie

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'66 VW 1300 96K miles
'97 E300D 239K miles
'85 300D 203K miles (sold Sep 2012)