Found a cheap Bosch 3-wire o2 sensor at Autozone. Its for an 86 Ford Mustang 5.0 V8, and only costs $40! Comes in a Bosch box and all! Bosch Part # is 13019. It also has 0 258 003 019 009 on the box. The o2 sensor for an 85 5.0 is single wire, and cost $25. Samir.