2001 VW Passat Intermittent immobiliser problems

check that the cam shaft is turning ( broken timing belt/chain will not allow position sensors to give spark). Check that the immobiliser is operational. have the fault codes read

my 98 passat estate has a fob with the drivers key which activates the alarm in the boot,bit like an immobiliser, just put it in the hole located near or on the alarm,should hear it beep.don't know if its a factory fit alarm.hope this was helpful.

put the key in lock and unlock/hold key over.windows will go down,then lock/hold key over windows will go up/sunroof will close(if fitted),then press and hold unlock button on remote for 30 secs,you have just reset the immobiliser........

Unfortunately the ignition barrel has been replaced with a new key,which has not been adapted to the immobiliser.The three core wire is from the reader coil which is supposed to fit around the ignition barrel.Obviously the key head was taped in the right position for the reader coil to read the key chip.Now the immobiliser is doing its job and cutting the ECU to stop it from running.It will take persiverance to find the right position to tape key back to coil for engine to run.Then your local VW Commercial dealership can readapt your key.

hi the problem you are having is due to the fact that the new key is not programed to your cars immobiliser so if your new key is the same as your old one you need to get it programmed by main dealers, inside the old key their will be a little glass tube that has the chip in that the imobiliser picks up allowing the car to start,

try holding your old key really close to the ignition then start your car and see if it keeps running if it does you have 2 options. either get you new key programmed or get someone who knows about electrics for cars and get them to take your old key apart and remove the chip for imobiliser and then they can glue this where the imobiliser is, this means the cover has to come off the steering wheel and the chip needs gluing to the imobiliser that surrounds the ignition barrel, dont try this yourself as you can damage the chip by forcing it out of the key and it is made of thin glass so is easy to damage your best option would be to get your new key programmed

Check in the black power box under the hood. Pull cover off and there is a diagram explaining what is what. Check the ignition fuse and fuel pump relay.

it should havea key with a transponder chip which is the factory immobiliser.your key has been coded/programed to your vehicle only,no other key will start your car.

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.

Your immobiliser is playing up, Easiest way would be tio run diagnostics, so you could find out what exactly causes imobiliser's malfunction.

Drop a line if you need more details

Best of luck

If im not mistaken,your car should have an alarm reset/override.Below the steering column,on the dash should be a slot where you put your remote transmitter to deactivate the alarm.If that works,you then need to have your remote checked and coded by a vw dealer.Good luck.