View Full Version : '94 k3500 chevy O2 sensor

11-26-2004, 08:15 PM
I have a 1994, K3500 Chevy rack dump with a 350, auto, 4x4. The problem is that when I bought the truck used, I did not notice the O2 wire from the sensor had been cut. I have a new OEM O2 sensor, but I am unable to find the wire that it connects to. I also cannot find the place where the other half of the O2 wire plugs into the engine/computer/throttle body or what have you.
Does anyone know where it plugs into or can direct me to a wiring diagram?
Thanks. I believe that once the problem is rectified, I will get more than 6 MPG.

Eric 1
11-26-2004, 09:05 PM
I have the same engine, i will look tomorrow and report back.

Eric 1
11-27-2004, 05:45 PM
Ok. On mine it is a single purple wire on the right side of the truck (looking from the front) It goes into the main harness. Here is a pic. Sorry it so dark, the flash on the camera did not work. the red line points to the wire. Hope that helps.

11-29-2004, 12:17 PM
Thanks, Eric1. I can see the wire harness near the steering shaft and the O2 sensor below.