[VAGguy]

Which code was it?

That "code" can also mean a break in the piping to/from the SAIP. It's just saying the O2 sensor is not detecting enough fresh air injection

 

[VAGguy]

I believe it's what is called a pending code. Like it has to be repeatable for so many consecutive cycles for the ECU to finally trigger the light or sit as a dormant DTC.

Even though you didn't mention a lean code, it'd be a good idea to check the whole solenoid pack under the intake manifold for cracks or tears in any of the vac lines. Especially the molded "F" shaped one that feeds the solenoids.

 

[VAGguy]

. Maybe drop the panel that holds the two solenoid valves under the intake manifold?

Yes. IIRC it's two or three bolts holding the solenoid plate to the underside of the IM. You might need an inspection mirror to locate them.