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Question for the experts: My 69 FI Sqrbk has an astonishing 9% CO at idle I just noticed. Amazingly it runs fine, gets 25 mpg at 75mph. I checked everything except the pressure sensor, which I know is slightly out of tolerance. Can the pressure sensor get my CO so far out of wack? I got some spare sensors but they're all 051C while I need 051B. Next weekend I will go to my favorite VW junkyard with about 30 - 50 type III's to get the correct one. Did they ever make a ECU with a CO adjusting screw like on the late type IV's? Martin Peitz