The green wire is actually the signal wire. It is a coaxial cable. The outer sheath is grounded. make sure you have the sensor connected only to the center wire. The two white wires are for the heater in the sensor. Make sure there is 12 volts when the engine is running. The sensor should also have shield plate to keep air and road debris away from it.

Dennis

----- Original Message -----
From: Christopher Gronski <gronski@GMAIL.COM>
Date: Monday, August 8, 2005 8:58 am
Subject: o2 Sensor on 2.1L

> Hi All,
>
> Last week I reported an interbucking problem, well Well I thought I
> had it solved. I went into the engine compartment and traced the three
> wires (there are three right?) that come out of the o2 wire that leads
> from the cat. All of them were disconnected.
>
> Two of the wires, both white, were disconnected at the plug. The plug
> was very difficult to reconnect. I actually had to put a tie wrap on
> it to get it to stay together. I recognize that there could be a
> problem with the connection here. The other wire, the green (a
> ground?), was also disconnected.
>
> I reconnected them but I'm still getting the bucking. Any thoughts?
> Could the fact that these were all disconnected have gummed something
> else up?
>
> Chris
>