Fail message when I try to use the emergency code

An immobiliser is generally a passive anti theft system (PATS) which uses an ignition key that has a coded transponder embedded in it. It is activated by being in close proximity to an antenna which is near or around the ignition steering lock. If the code in the key matches the code in the module and everything is working correctly the engine management switches on - simply put, the immobiliser engages or activates when the key is removed and should deactivate when the key is inserted.

It is possible the system developed amnesia and forgot the code when the battery was disconnected or maybe something broke. I really don't know much about them.
A trick that sometimes works - try disconnecting the battery overnight and in the morning open the car, put the key in the ignition and switch on and then go and connect the battery.

If that doesn'y work you will need the services of an auto locksmith or the dealer.

the immobilizer will only disable its self if the right key is used to try and start the car (EG: only the registered car key is able to turn on the car and run it otherwise the immobilizer triggers after a few or more failed tries to start the car)

the immobiliser block the engine because the sysytem dont reconice the key fob try other key

My hyundai accent giving p1801 and p1805 the car dont start what should i do.regds Maxwell,

your key transponder may be faulty, you would need to take the keys to a dealer and see if they can read the codes from them, if not, the car wont see them either.

If a yellow key symbol is flashing on your dash then this is another indicator of the key failing. If the plip cannot unlock the car either and only the key blade will do it, then the immobiliser may need re-coded to your keys after the battery replacement, or if it has worked since then, and the stopped recently, I would suspect the transponder chip in the key.

1-insert and remove key from ignition two times

2-close and open driver door two times

3-insert and remove key once from ign.

4-close and open drvr door twice

5-insert key into ign.,then close driver door

6-turn key to on (not start) then off, twice this is rewrite mode,have all remotes to reprogram it will clear any lost remotes.

7-remove key from ignition,the door locks should cycle twice.if not start over.it may take a few tries.

8-press lock/unlock together and hold for a second

9-release,and press lock on remote,the door locks will cycle confirming program.continue to do other remotes you have,steps 8 and 9.if only one in possession,you are done. To end mode open door or insert key into ignition.

You'll need to follow the steps with no more than a 1-2 second delay between each step.. hope it works

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.

If, when you switch the ignition on, you get a dash light on, the symbol is a car with a key overlaid, you have somehow activated the immobilser You could try disconnecting and reconnecting the battery, this may reset the immobiliser, If this does not work you will have to contact a Hyundai dealer to get the immobiliser unlock code.

You need to get your key reprogrammed at your dealer... Did u drop the key as this can sometimes cause the key to loose the code, i dont know hoe all i no is i had to get it done a few times.

have you tried another key