The key is faulty or the immobilizer will not accept the code. remove the battery for 30 mins to allow the system to reset.
The Engine Immobilizer Indicator Light is supposed to flash continually when your key is removed from the ignition because it is part of the security/alarm system. The engine immobilizer is the " kill switch " that will not allow the engine to be started without your key which has a microchip in the top ( the black part of the key ). When the EII Light is flashing it indicates that that part of the alarm system is active and working. If the light does not blink when key is removed THEN it needs to be fixed.
rear window defroster light keeps flashing
The overdrive off light flashing - indicates a malfunction has been detected
if it keeps flashing on and off
I have Samsung tablet screen flashing and cannot turn off
From my experience this was followed about 2 months later by the whole display expiring. Renault replaced under part warranty for set price of £100 (March 2010). I found the trip meters kept resetting as well - don't leave it too late taking to Renault though, when the whole display started flashing on and off it added about 100 miles per flash to the odometer
overdrive light keeps flashing
It is because the car does not recognise the key. It could be the decoder ring, key, wiring or recoder. It is usually the key thats failed. Give it a good knock on the steering wheel and try it. If it still dosnt work, try a few more times. If if it still dosnt work carefully take it apart and check for corrosion, if its corroded its probably beyond repair. Give the electronics a rub with your thumb, if it still dosnt work it could still be the key or it could be something else. It will need correctly diagnosing
might be a misfire in a cylinder...
Its broken.
Flashing lights - by Kanye West
If the hold light keeps flashing on a Kia Sportage a sensor may be malfunctioning in the light. The flashing light could also indicate that a speed sensor is going bad.