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Friend's 94 GS300
Code pulled up was for an O2 sensor. It was replaced with a new unit.
Problem is, the check engine light is still on. We've tried removing the battery for up to a full day, but as soon as it's put back in and the car is turned back on, that light turns immediately on.
Does this car require a special tool to reset the light? My BMW requires some prongs to be jumped whenever the service light goes off...