Key won't register on ignition on and say's"incorrect key" with spare key(original key is lost) 2001 9-3 Saab 4 cylinder turbo

S (Nissan Vehicle Immobilizer System-NATS) has the following immobilizer functions:
Since only NVIS (NATS) ignition keys, whose ID nos. have been registered into the ECM and IMMU of NVIS (NATS), allow the engine to run, operation of a stolen vehicle without a NVIS (NATS) registered key is prevented by NVIS (NATS). That is to say, NVIS (NATS) will immobilize the engine if someone tries to start it without the registered key of NVIS (NATS).
All of the originally supplied ignition key IDs have been NVIS (NATS) registered. If requested by the vehicle owner, a maximum of five key IDs can be registered into the NVIS (NATS) components.
The security indicator lamp blinks when the ignition switch is in "OFF" or "ACC" position. Therefore, NVIS (NATS) warns outsiders that the vehicle is equipped with the system.
When NVIS (NATS) detects trouble, the security indicator lamp lights up while ignition key is in the "ON" position.
NVIS (NATS) trouble diagnoses, system initialization and additional registration for other NVIS (NATS) ignition key IDs must be carried out using CONSULT-II hardware and CONSULT-II NVIS (NATS) software. Regarding the procedures for NVIS (NATS) initialization and NVIS (NATS) ignition key ID registration, refer to CONSULT-II OPERATION MANUAL IVIS/NVIS.
When servicing a malfunction of the NVIS (indicated by lighting up of Security Indicator Lamp) or registering another NVIS ignition key ID no., it is necessary to re-register original key identification. Therefore, be sure to receive ALL KEYS from vehicle owner. System Composition NIEL0174 The immobilizer function of the NVIS (NATS) consists of the following:
NVIS (NATS) ignition key
NVIS (NATS) immobilizer control unit (IMMU) located in the ignition key cylinder
ECM
Security indicator lamp.

ANTI-THEFT SYSTEM ! Did you change KEY'S

Without knowing the resistance of the pellet on the key the anti -theft system will not allow it to start .

PASS-Key® II is a registered trademark of the Delco Electronics Corporation.
When a key is inserted in the ignition, the contacts located in the ignition cylinder contact a resistor pellet located in the key. The instrument cluster (IPC) measures the resistance of the key pellet. The IPC then compares this value to a value stored in the IPC's memory. The IPC then performs one of the following functions: A new key shouldn't cost that much , a whole new ignition lock cylinder with a new key can be bought for $36.00 . on line .

New keys with cylinder may not have a transponder chip , or new keys will need to be programmed. you will require two keys equipped with proper transponder for your vehicle, and either new keys cloned with the old transponders. If you have lost the original keys , you will need someone to remove the original keys from the pcm , than marry the 2 new keys to the pcm. If you have an original key , try placing it by the lock cylinder when attempting to start with the key supplied with the new ignition cylinder.

Locksmith?

still could have a fault in crank sensor wiring ,,, you need to plug in diagnostic tool when it wont start and see if you have a engine revs reading ,,, also check if fuel is getting to the engine ,,,, that car also has immobiliser so try spare key to see if problem goes away ,,,,,, wont get codes on that age group unless problem happens when driveing

shudd had a new key made-using the serial car number when u lost it--the scrap unit probly not responding to ur computer---send problem to [email protected]

The doors work on a different system to the ignition. The doors will unlock but the ignition key immobiliser is specific to each car. That means the car won't recognise the key. Replacing the lost key would have been the easiest fix even though it costs a lot. All you need is the vehicle details for your car. I was quoted £200 for a replacement Vauxhall key. Cheaper than replacing steering columns and associated electronics.
Your only other option is to take it to a Saab Dealer/specialist and pay the 'silly money' for them to reset and link the replacement scrap car key to your car.

The steering wheel was turned when the key was removed. So when you try to turn on the key, turn the wheel one way and the other way to release the pressure on the key. The key should turn ok.
Hope this helps.

the ignition keys are not coded. no "chip" in them you should be able to just have a spare key cut and it will work fine. These use an electronic device in key cylinder that senses the proper rotation of cylinder and tumblers. so if someone tries to pry on with a screwdriver it will disable starter. when this is replaced it has to be reprogrammed

Your ignition lock probably has sticky pin inside of tumbler.
Try spraying some WD40 or PB Blast into the key cylinder.