I'd expect the code to mean exactly what it says: the circuit through the
wastegate solenoid is open, meaning either the wiring is disconnected somehow,
or the solenoid core wiring has broken.
I don't know which way the solenoid actuates on the 1.8t (ie: is the gate
normally open and closes only when the solenoid actuates - or the gate is
normally closed and the solenoid opens the gate). If it's the former, yeah,
you'd expect a profound lack of grunt, but if it's the latter, the power
should be mostly unaffected, but it opens the possibility of over-speeding the
turbo or blowing out the induction system plumbing...
'00 s4 6spd
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