Yup! I know I've done my reading on CIS and compared it to the D-jet, and I admire CIS' simplicity,. I suspected the WUR to be faulty, but wasn't sure as there are a few other items that could be culprits.

so when a WUR fails, or goes into a failure mode, is it the heater that burns out? (resistance test?) or is it the bimetallic spring that weakens?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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