Well, I wrote too soon!

P 97.12 and 97.18 in Bentley manual show an "OXS relay" for California only.

I couldn't figure its' purpose so searched the samba Bay forum and
found this AFC PDF:

https://www.thesamba.com/vw/archives/manuals/afc_fi_training_troubleshooting_manual/AFC_FI_Training_Troubleshooting_Manual.pdf

Between it, and Bentley, I now see that "California Only" have this
relay and an O2 sensor.

Comments in Full Throttle Switch and Oxygen Sensor sections indicate
to me that the OXS relay serves to work in conjunction with the ECU to
control the O2 sensor input.

As a guess, if you were thinking of doing this, I'd suggest that
simply deleting the OXS relay is not a good idea.

Neil.

On 5/5/20, Neil N <musomuso@gmail.com> wrote:

> I should probably open up a manual to confirm but I really doubt that
> even the CA emissions equipped air cooled 2.0 fuel injection system
> uses an O2 relay. i.e the O2 sensor does not have a built in heater
> element requiring a relay to switch it on/off.

-- 
Neil n

VE7TBN

1988 Westy 50º ABA swap: https://tinyurl.com/yap5hpwt

1981 Westy 15º ABA swap: https://tinyurl.com/y9n4xob8

VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>