86-95 02 sensor
#3
85-87 use 1 wire sensor in exhaust manifold under hood. Starting in 88 they went to 4 wire heated sensors located underneath vehicle in the exhaust pipe. I'm not sure on the part numbers but 234-1056 is a 1 wire and 234-4161 is a 4 wire but it looks like it goes to 95 and newer.
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