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I don't think the 30,000 mile replacement applies to systems with the newer 3-wire Oxygen sensors. That is why the "change sensor " light was removed. The Bentley shows replacement at 30,000 miles for 1983-1984NA. Yes, the three wire sensors are expensive. The two extra wires are for the heater in the sensor which makes it come upo to operating temperature sooner, I guess. There has been some discussion on the BB about substituting one wire universal sensors successfully. Maybe a search of the archives would turn up some information.
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