* Key Only Opens Driver's Door: This strongly suggests a problem with the lock cylinder on the passenger door, trunk, or both. The lock cylinders might be worn, jammed, or simply not receiving the signal from the key. It's *possible* it's related to the ignition issue, but not necessarily.
* Key Stuck in Ignition: This is a serious concern. It could be caused by several things:
* Ignition Switch Failure: The most likely culprit. The switch itself might be worn out, causing intermittent failures and sticking.
* Steering Column Issues: The ignition switch is mechanically linked to the steering column lock. A problem in the steering column mechanism could be binding the ignition.
* Faulty Wiring: Damaged or corroded wiring to the ignition switch can also cause problems.
* Security Light Always On: The constantly illuminated security light points to a problem with the car's theft deterrent system (likely PassLock or similar). This system might be interfering with the ignition, contributing to the key sticking. A bad PassKey Transponder in your key is a possibility.
* Repossession History: The previous owner may have tampered with the locks or ignition system. This increases the probability of unusual issues.
What to do:
1. Don't force anything: Trying to jiggle or force the key further could damage the ignition switch beyond repair.
2. Check the Obvious: Look for anything blocking the key from turning (e.g., debris).
3. Replace the Batteries (if possible): In *some* cases, a low battery can contribute to intermittent ignition problems.
4. Professional Diagnosis: This is highly recommended. Take the car to a qualified locksmith or a reputable mechanic experienced with Buicks. They have the tools and expertise to diagnose the ignition and security system issues. They can also check the wiring and the lock cylinders.
5. Key Replacement: If the locksmith or mechanic suspects the PassKey transponder in the key is bad, you'll likely need a new key programmed for your car. This needs to be done by a shop with the right equipment.
Ignoring these issues could lead to being stranded or incurring significant repair costs later. The combination of problems suggests more than just one simple fix; it's likely a cascade of related problems. A professional diagnosis is your best bet for a safe and cost-effective solution.
