If the CKP sensor has failed, it won't start.
You can Google the codes through the VCDS/Ross-Tech website, to get their descriptions, and in most cases, some basic trouble-shooting advice.
'07 Transporter 1.9 TDI
'01 Beetle 2.0
With your code reader, erase the codes, and see what comes back.
If it comes back, view the live data of the engine speed while cranking. It'll either show up, or it won't.
'07 Transporter 1.9 TDI
'01 Beetle 2.0
http://wiki.ross-tech.com/wiki/index.php/00670
16507/P0123/000291 - Ross-Tech Wiki
01262 - Ross-Tech Wiki
Hope these help.
N75 boost solenoid failure is common, as is a faulty throttle body. But do the diagnostics first, to confirm.
'07 Transporter 1.9 TDI
'01 Beetle 2.0
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