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It is likely that you have water ingress in the rear boot latch,you must remove the latch and dis-connect the little connector, you will soon notice if water has been there, this will require a wiring repair and replacement latch,quite common on the 3B passat, you might find that the water is getting behind the boot handle.
My passat boot lock does the same because someone forced the lock one night, i replaced the lock barrel but from time to time the white plastic acctuator or pump if you want to call it that jams in the open position and needs a small tap with the boot lining removed to free it up.A replacement is only £23(U.K pounds) or just spay a little lubricant in the mechanism to free up the mostly dry plastic parts.
There may not be any other way to fix it except to replace your instrument panel. That's where your immobilizer is located. Or you could try this:
Try cold-booting the car. Remove both battery cables from the battery.
Short the battery cables together (away from the battery) for about 15
seconds. Reconnect the battery. No guarantees - I found this info at tdiclub.com.
you need to remove front bumper , remove front into service position , remove aux belts set timing marks up ( you will need to use locking tools ) lock crank and cam shaft remove belt replace belt and tensioners . please note it is also use full to check water pump