Car immobilisor i recharged the battery today and put it back on, went to start the car all the ignition lights come on but engine wont start is there a reset switch under the bonnet for the immobilisor (vw golf gti 2000)

There is a strong possiblity that the key is either stripped OR the key code has been tampered with.

no idea here iam afraid ,but a lot lot of VW products have like a a big connection block on the positive battery terminal perhaps something here is amiss,failing which try locking and unlocking the drivers door three times then try try starting the vehicle withing 15seconds in casae the immobilisor is on.,This often happens with cars that get a flat battery as i look after a lot of vehicles that are in a long term airport parking and som of the faults are right weird and wonderful .Firstly renew the battery then check what i mentioned but yes the battery if a bit old will not hold a charge then the immobilisor comes on as it goes flat ,also try this and thats to join the + and neg battery terminals together and leave for a while then fit a new battery and try it agin and iam sure it will start

one of three things here i think ,either immobilisor ,try the spare key or the starter motor is not working maybe the switch on the back of the ignition lock or a relay ,in all honesty i would need my head under the bonnet to know exactly what fault this one is .

yes i know what these cars are like ,a right pain in the you know where and the only solution is to calkl a truck and have it taken to the dealer ,its a europeon vehicle and uses encrypted software ,Now on earlier models you still get a spark and the immobilisor only shuts of the fuel pump so if you try running a hot wire direct to the fuel pump it should start anyway ,check for polarity on the sender unit where the fuel pump is ,access can be gained from under teh back seat on this vehicle ,if you do have to have it re-programmed then once its running with teh key cut the thrid wire on the immobilisor reader in the drivers side footwell with teh engine running and then it thinks it still has the key in the ignition .I HATE RENAULTS

dealer only factory immobilisor has cut in

Yes, this sounds like a flat battery. You could try to get a jump start off someone else, so that you know it is definately not the engine. Otherwise, purchase a new battery and you should be fine.

Check for a broken connection on the starting motor, they usually rust off right where they are bolted on.

Sounds like starter selanoid, but first make sure battery connections are clean and tight, if sure they are then turn on headlights and try to start if still clicks and lights dim its starter.

check the Ignition Starter Switch (tipical on tb)

have you not left any load on overnight?..like park light or left the door partially open and the dome light would be left on?

have the battery recharge and the next night, make sure that no light would be left on the car.

if it would drain out again, have it recharged again, use it and on the night, make sure no light is left on the car, then remove the positive pole on the battery overnight.

the next morning, put the positive cable back and start the car.

if the car would start, then no problem with the battery, if the car would not start, then return the battery because it is defective.

tnx 4 using fixya,

drcool