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I'm a 15 Yr ASE Master technician and I will need to ask a few questions before I can suggest a repair.If your vehicle was operating fine before you lost the key, then it sounds like a security issue.. I see you used a 2nd key, but has that key ever been programmed? Is there a security light on in dash? Here is what you need to do:
Unlocking Doors with Key or Remote should DisArm the Factory Alarm
If you think this is the PassLock Key causing the problem,
If you have "two" Keys, try the other Key
Otherwise you can attempt to "Relearn" the Key
This procedure will only relearn the vehicle keys.
This procedure will not learn the immobilizer prerelease password XXXXX the challenge/response data.
Do not use this procedure as a substitute for a 10-minute relearn when replacing or reprogramming a TDM or ECM. Doing so will result in a failure to learn the prerelease password XXXXX the challenge/response data.
This procedure will erase all previously learned vehicle keys from the TDM.
Once the 30-minute learn procedure has been completed, any remaining vehicle keys may be programmed using the Adding Keys procedure to ensure their continued functionality.
1) Turn ON the ignition, with the engine OFF.
2) Observe the security indicator, after approximately 10 minutes the telltale will turn off.
3) Turn OFF the ignition, and wait 5 seconds .
4) Repeat steps 1-3 two more times for a total of 3 cycles or 30 minutes .
NOTE: The TDM learns the key transponder information upon the ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
Start the vehicle.
The vehicle has now learned the key transponder information.
If none of the above are successful, then use of Dealer Scan tool is needed to Test System
If you need anymore assistance, feel free to ask
Have a greatday!!!