Various 99s were equipped with Lambda system for 1977-1980 depending on the market they were sold in. All California cars, some "high altitude" cars, and all Turbo cars in that timeframe have Lambda system, which includes the O2 sensor (lambda sensor), modulating valve and lamda-specific fuel distributor, catalytic converter, lambda control module (under passenger seat), and the associated wiring and relay as mentioned. You should be able to tell what the emission package was originally by looking at the emission label on top of the left fender near the coolant expansion tank. As a general statement, a lamda fuel distributor will not work very well if the rest of the lambda system is not working. So on the one hand I would suspect that the O2 sensor may just be there to plug a hole if none of the other hardware is present. On the other hand, that would assume that somebody outfitted you with a non-lambda fuel distributor but that you still have the lambda exhaust. I'm pretty sure that all the lamda cars had a single exhaust downpipe from the manifold, whereas all the non-lambda cars had a dual downpipe. I have a chart of all the various emission packages I can send you if you shoot me an email off-line.
As far as the horn, sounds like some basic wiring troubleshooting is in order - I'd start with the connection/wiring in the steering wheel, pull the horn pad/button off and see if something is grounding the wire.
posted by 70.100.14...
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