You will ground one lead of the meter to the engine, and run the other
lead to the O2 sensor. It puts out less than 1 volt. Most meters
will have a 1.5 volt scale, this is where it should be set. DC range.
The O2 sensor puts out very low current. Adding the meter, could give
you a false reading, because a cheap meter will add a load to the
circuit, witch draws down the real output voltage.

            Eric                   86-VW4x4
            vw4x4@fyi.net          86-SS Syncro
            Pittsburgh, PA USA     1936-Chrysler
                                   92-Jetta GWC
            www.fyi.net/~vw4x4/vw4x4.htm

On Thu, 17 Jun 2004, Ryan Dawson wrote:

> Hi Everyone,
>
> Can someone tell me whether I should have my multimeter set on AC or DC
> current, and what scale I should have it set at to take the reading?  This may
> be a dumb question, but I have no idea as I just got this tool.
>
> Also, if there is an exhaust gasket missing between the muffler and the CAT,
> will this affect the O2 sensor?
>
> Thanks,
> Ryan
>