Does anyone know where I can buy a plug and play O2 extension harness for a 1994 sc300(single wire)? Bought a new header and the OEM O2 wires are way too short. Don't really want to start cut and splicing unless absolutely necessary.

 

its only 2 wires to splice so it's not that bad... just saying lol

 

there are none, get some wire cutters and some crimp on connectors if you can't solder and start having some fun.

 

Casper Electronics makes O2 extension harnesses.

But it looks like they are for 4 wire sensors.

If you do have 1 wire sensors, it's just best to cut and extend it. Just use solid connectors and waterproof them with heatshrink tubing

 

Home Depot/Lowes sells these butt connectors that have solder in them already and heat shrink tubing around them. They work great. Just slide it over one end, twist the ends together, slide it over the joint and heat with a heat gun. it'll melt the solder in and make a good connection then shrink the tubing around it all in one shot. They're transparent so you can see the solder is good as well.