kenneth d lewis wrote:

> Jay;
>         Good question. I have not tried this yet, but will since it
> sounds like a good idea. How about removing the O2 sensor and finding an
> "O" terminal that fits over the threaded part. Then crimp and solder a
> ground wire. Screw all back in an ground to common spot on head.

That would be very neat. I just used one of the catalytic converter bolts as
grounding connection.
I didn't think that the engine block was a meaningful OXS ground to ECU pin
19. The OXS ground had to have some circuit connection with the OXS itself
for the OXS signal to have any meaning.
While I'm at it, the AFM has a similar ground problem. The AFM is mounted by
plastic and has no electrical connection to the engine or chassis. In my
opinion, the AFM voltage signal is floating relative to chassis ground. In
very dry climates where dusty air flow builds up quite a static charge, I
didn't think this was a good idea so I added a grounding wire from the AFM
to the chassis.
IMHO extra grounds can't hurt.
-Larry