My guess is ICM/EZL also.Try tapping it, it's worth a try as it works for my spare. Last I checked, new EZL's were over $1k. Used are a couple hundred to as high as $800 on eBay. Make sure you get the correct or compatible part number.

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'94 E320 Cabriolet, 110k, black, stock, SOLD
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'91 300E, 209k, white, rebuilt head SOLD
'74 914-6, grey, 2.7L 325hp twin turbo Audi conversion