My subaru impreza key won't work the immobiliser. I can lock and unlock car and alarm doesn't go off. But when I press key on button nothing happens and I can't start car

If it's a push button start that you're talking about, make sure your brake lights are coming on when it's acting up. Sometimes I've had intermittent brake on/off switches cause a no crank concern because the car doesn't know you're stepping on the brake pedal. Just have someone watch the brake lights if it acts up on you.

Subaru Impreza

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Sounds like your cars battery is dead. Try charging it. Even if it starts after you charge it, it may need a new battery.

YOU MUST HAVE SOME THING WITH THE KEY REMOTE OR THE BATTERY IS LOW OR THE REMOTE IS NO GOOD TRY TO CHANGE THE BATTERY FIRST AND SEE HOW IT GOES.

ON NISSAN MANUALLY LOCK ALL DOORS THEN UNLOCK THE PASSENGER DOOR WITH THE KEY THEN THE DRIVER DOOR THEN PRESS AND HOLD THE BRAKE PUT KEY IN IGNITION THE CAR SHOULD START NOW THIS RESETS THE ALARM

you need to reset alarm/immobiliser.lock car with remote, hold button down for 30 secs,then press/hold down unlock button,should reset.another way is with key in ignition/turned on, press alarm button down and hold for 30 secs.this resets immobiliser.toyota
systems vary..depending on market.

first unlock car manually with key remove driver side kick panel/lower A pillar trim connect locking registration wires together(two white connectors,black wire and black and blue wire)press and hold central locking switch on drivers door in the unlock position .interior lamp will flash and an acoustic sound will be heard. now get your key and press unlock and then lock the door should lock then unlock, job done ,i persume it was to program the fob to work the central locking u wanted

usually after opening the door you can deactivate the alarm by pushing th unlock button or simply insert keyy in ignition and turn it on.

Just a possibility, but a discharged battery could be the culprit. Do the headlights come on brightly? Will the horn blow normally? A 'dead' battery will usually have enough power to illuminate LED warning lights, while not having enough current to operate the starter/door solenoids, etc. Have somebody test the battery voltage to be sure.