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Hello Craig and welcome to JA!!!
I'm Billy and i will assist you with this.
Let me explain first the third error:
The secondary air injection, is a system, with an air pump, pumping fresh air into the exhaust, while the engine is cold, this would lead to thermal post combustion (any remaining unburnt fuel, resulting from the cold start rich mixture, would burn inside the exhaust).
This would protect the catalytic converter from unburnt fuel, and would also speed up the heating of the oxygen sensors and catalytic converters (which start operating at about 300 C)
Now the switching valve, is the valve opening to let fresh air from secondary air pump in the exhaust.
You have a circuit malfunction, that means mainly, there's a loose connector or even the valve is defective.
Given the other details you have, i would suggest to check the following:
- check if battery cables contacts are tight and clean.
- check if engine ground cable has clean and tight contacts
- check for any blown fuses in fuse/relay box.
- tighten/press the fuses well into place.
- check if the drive belt is loose
- check for any loose connector(s) in engine bay (take a thorough look at all the wiring harnesses)
- check if immobiliser light is on all the time, meaning you have an immobiliser fault preventing the start up.
- check if check engine light is flashing when you try to start your engine.
- check for any disconnected hoses or lines (mostly air hoses).
Now having performed the above described check sequence, you will most probably get your culprit (which i think is the same causing many faults). Then delete the errors, and the vehicle should operate normally.
Get back to me for further questions or clarifications.
2003 Jetta left rear window blue plastic part of the