I have an 89 n/a. One sensor. Everything I've read on internet says its not a common failing part. Many have problems with wiring.
I doubt that code will make it run rich (unless you really are in open-loop while code is set).
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Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing.
TEMS, and some nice MODS. Sold to a friend 10/08/08.
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