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Vacuum leaks cause the engine to run rich, running rich causes the O2 sensor to go bad.
Yes, the PCV 'system'. If it hasn't been replaced yet, it is over due. The piping gets old and cracked and the PTC nipple gets clogged. Check for oil leaks.
The T5 is the high pressure turbo with gobs of bhp. It has all of the options, similar to a GL 240. If it has been taken care of, then there will not be too many surprises.
The AC evaporator does tend to leak. Replacing the evap is like replacing the 240 heater core, just more wires to deal with.
Klaus
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Cynthia Amendt, RIP
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