2006 vw jetta 2.5 wont start or crank has new battery, ignition switch, and starter

SOURCE: Turn ignition key but won't start..All power on, is it starter?

Can be a Junk Relay, access is limited, but giving the Starter a "crack" with a mallet, often cures the problem temporarily. But check the Battery terminals, and Cable to the Starter solenoid ,first for tightness and security.
Regards,DT

SOURCE: 2002 VW Jetta 1.9 diesel. Cranks fine but won't start!

check fuel rail pressure with a gage from renting from auto shop shold hold 30 PSI for 60 seconds if not replace fuel pump.

SOURCE: 1996 VW jetta will not start

You vehicle works off a standard ignition key which links to a electrical ignition switch. The wire from the switch goes to the starter solenoid. That wire has a fusable link which operates like a fuse. If to many amps surge through this wire it will melt down inside the insulation. The insulation will not melt away causing a headache to most novice mechcanics. Pull on the solenoid wire a few inches away from the solenoid and see if it stretches at least 1/8 of an inch or more. If it does it has an open stopping the continuity to the positive lug to the solenoid preventing it to work. Any auto parts store sells these fusable links. The counterperson will suggest the crimping supplies and tools needed to purchase for this repair

SOURCE: 2006 vw jetta No power on drivers door.

I have the same Problem. I Simply cut into the middle of the boot between the door and body The broken wire was right there, I pulled each end out and held the wire there with a pair needle nose pliers, stripped the end with a knife and attach a mulyi-strand jumper between both ends with electrial wire twists. Leave 2" approx. then slip the boot back over them. Use # 14 Wire. A Quick reasonable fix. If brakes again repeat again. The new Haness will have the same Problem down the road.
John

Testimonial: "I had the problem fixed at the dealer. It was the harness They made the harness longer & it was free.. "

SOURCE: VW Jetta Crank Postioning Sensor

The crankshaft position sensor is also called engine speed sensor it is located next to the oil filter. it uses one 10mm bolt to hold it on.