Possible Causes:
* Shift linkage: This is the most common cause. The linkage connecting the shifter to the transmission could be bent, broken, or disconnected. This is relatively easy to inspect visually, but you'll need some mechanical knowledge to repair.
* Transmission problems: Internal transmission issues (like a broken shift fork or worn components) can prevent the car from going into park. This is much more serious and usually requires professional repair.
* Low transmission fluid: While less likely to *completely* prevent shifting into park, very low fluid can cause shifting problems. Check your transmission fluid level (it should be checked when the engine is running and warm).
* Broken shift cable: Similar to the linkage, but a broken cable itself will prevent proper shifting.
* Parking pawl: This is a mechanical component within the transmission that engages to lock the transmission in park. A broken or worn pawl is a serious problem needing professional attention.
* Electrical issue: While less common on older cars, a faulty shift interlock solenoid (which prevents starting the car unless it's in park) can sometimes interfere with shifting into park. This is less likely to completely prevent it, but could be a contributing factor.
What to do:
1. Safety First: Do not leave the car unattended. If you must park it, use wheel chocks to prevent it from rolling. Engage the emergency brake (parking brake) firmly.
2. Check Transmission Fluid: Check the transmission fluid level and condition. If it's low or dirty, it might be contributing to the problem. However, simply adding fluid is not a solution if there's a serious internal transmission issue.
3. Inspect the Shifter Linkage: Carefully look under the car (with the engine off!) to visually inspect the linkage connecting the shifter to the transmission. Look for anything bent, broken, or disconnected.
4. Try gently rocking the car: Sometimes a slight shift in position can help free a stuck linkage. Do this very carefully.
5. Professional Help: If you're not comfortable inspecting the linkage or if the problem persists after a quick visual check, take the car to a qualified mechanic immediately. This is a serious safety issue that should not be ignored. Ignoring it could lead to the car rolling unexpectedly.
Important Note: Attempting to force the shifter into park could cause further damage. Only gently try to move the shifter if you suspect a linkage problem. Otherwise, leave it alone and call a mechanic.
