The old one looks being there for a long long time. So I decided to replace it. I searched this forum and grabbed a Bosch 13953 from my local Napa store for $43. The Bosch 13953 is for a 90' Mustang 5.0 engine. It has two white color wires and one black wire. The old oxygen sensor has the same colored 3 wires. So I just cut/connected those wires, white to white, black to black. I guessed that there should be no difference between those two white wires and hope I did not mess them up. So far so good...
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