Of course it's fixed!

Ethernet cables carry electrostatic and tiny magnetic pulses. Any disruption in those cause packet loss. If you managed to fix an ethernet cable like this, I wouldn't be very worried about your ability to splice in a new o2 sensor; however, I'm surprised you didn't solder the connections. Electrical tape doesn't stick when it's hot, and it turns gooey. It's not good around manifolds. I solder and shrink-tube everything because of heat, vibration, chaffing, corrosion and the like which are pretty extreme for most electronics, but the norm for auto environments. But if it's fixed, then you obviously got it right :thumbup: That's one dang fancy looking connector you've got there.

The largest danger in automotive sensor applications is with wire lengths and gauge because that makes the largest impact on resistance if things are all connected properly. A properly soldered pair of wires aren't butt connected, They're twisted linearly and soldered. This actually increases the electrical contact area between the two wires, and there won't be a measureable loss in the circuit. Just don't add a few feet of wire or MonsterCable splices to the circuit and you'll be fine for something like this.

Save your money and buy the universal one.