Which one is the O2 sensor relay??
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Should be the same as my 88 Cabrio.
First you look over your drivers side fender, looking just forward of the shock tower.
Pull the black cover off that covers the 3 relays.
From front of car to rear= main relay(5 prong) then fuel pump relay (4 prong), then the one most towards the windscreen is the O2 sensor heater relay (4 prong).
and
heres a ETM for your carsigpic
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