* Steering Wheel Lock: The steering wheel might be locked. Try gently jiggling the steering wheel while turning the key. This is often the simplest fix.
* Shift Lever Not in Park (or Neutral): Make absolutely sure the automatic transmission is in Park (or Neutral for a manual). This is a common cause.
* Faulty Ignition Switch: This is a major component. If the switch itself is broken or malfunctioning, it won't allow the key to turn. This is a more serious issue requiring replacement.
* Faulty Ignition Cylinder: This is the part where the key goes. Wear, damage, or internal problems can prevent the key from turning. Replacement is likely needed.
* Security System Issues: The car's immobilizer system (which prevents theft) might be malfunctioning. This will prevent the car from starting even with the correct key. This often requires a dealer visit or specialized locksmith.
* Wiring Problems: Damaged or corroded wires in the ignition system can prevent the key from turning or the car from starting.
* Broken Key: While you say you have tried, a partially broken or damaged key may not be engaging fully with the ignition cylinder.
Troubleshooting Steps:
1. Check the obvious: Transmission in Park/Neutral, gently jiggle the steering wheel.
2. Check the battery: Even though you've tried a wheel start, a very weak battery *could* still be preventing the ignition system from powering up correctly. Try jump starting the car with a good battery and strong cables.
3. Try a spare key (if you have one): This helps rule out a problem with the key itself.
4. Listen for clicks: When you turn the key, do you hear any clicks from the ignition system? Clicks usually indicate a partial electrical connection.
5. Inspect the ignition switch and cylinder visually: Look for any obvious damage or signs of wear and tear.
If none of these simple checks work: You'll almost certainly need to have a mechanic diagnose the problem. The issue could be anything from a simple fix (like a stuck ignition switch) to a more costly repair (like needing a new ignition cylinder or switch). Trying to force the key could cause further damage, so avoid doing that.
