Why wont my key turn in the ignition Lexus RX300?

Short answer: the most common reasons are a locked steering wheel, the gear selector not fully in Park, or a worn/damaged key or ignition cylinder.

In the Lexus RX300, these issues are typical as the car ages. A steering column lock, a misaligned transmission interlock, or a worn key can all prevent the key from turning. More persistent problems may involve a sticking ignition cylinder or, less often, an immobilizer/key programming issue. The following guide outlines likely causes and practical steps to diagnose and address them.

Common causes

Several mechanical and security features in the RX300 can prevent turning the key. The list below highlights the most frequent culprits to check first.

• Steering wheel locked or under pressure from the column, which can prevent the key from turning.


• Transmission not fully in Park (or gear selector misalignment) which can block the ignition interlock.


• Worn or damaged ignition key that won’t properly engage the tumblers.


• Dirty or worn ignition lock cylinder that resists turning.


• Sticking or failed ignition lock mechanism due to age, debris, or corrosion.

If one of these is the cause, a straightforward fix may solve the problem. If not, more in-depth service could be required.

Troubleshooting steps

Follow these practical steps to safely diagnose and potentially resolve the issue without causing damage to the ignition system.

1. Confirm the vehicle is in Park and press the brake pedal firmly before attempting to turn the key. On many RX300 models, the key will not turn if the transmission is not fully in Park.


2. Gently wiggle the steering wheel left and right while trying to turn the key. A temporarily locked column often releases with a little movement of the wheel.


3. Try a spare key. If the spare works, the original key may be worn or damaged; consider replacing or duplicating it.


4. Inspect the key for wear, bending, or corrosion. If the key is damaged, replace it and avoid forcing a worn key into the cylinder.


5. If you can access it, apply a light graphite-based lubricant to the key and cylinder (avoid oil-based lubricants). Insert and gently twist the key to distribute the graphite. Do not force the key.


6. Check for signs of immobilizer issues (security light on the dash). If the security system isn’t recognizing the key, or if the key turns but the engine won’t start, immobilizer programming or key issues may be involved. In that case, plan for professional help or dealer programming.

If these steps don’t restore turning the key, you may be facing a failing ignition lock cylinder, wiring issue in the steering column, or a more complex interlock problem requiring professional service.

When to call a professional

If the key still won’t turn after troubleshooting, professional help is advisable to avoid damage to the ignition cylinder or steering column.

• Locksmith or dealership to inspect and potentially replace the ignition lock cylinder and/or rekey the ignition.


• Mechanic to assess the steering column, ignition switch, and interlock system for mechanical or electrical faults.


• If the immobilizer or key programming is at fault, a dealer or locksmith with Lexus-compatible programming tools may be required.

A qualified technician can safely diagnose the root cause, perform any necessary replacement parts, and, if needed, reprogram the key or immobilizer to ensure proper operation.

Summary

Key turning issues in the Lexus RX300 are most commonly caused by a locked steering wheel, Park/shift interlock not engaged, or a worn/damaged key or ignition cylinder. Start with simple checks—Park position, brake engagement, steering wheel movement, and key condition—before moving to lubrication and more involved diagnostics. If basic troubleshooting fails, seek professional help to avoid causing further damage and to ensure proper ignition and immobilizer function.

Why won't my key turn in the ignition Lexus RX300?

A Lexus RX300 key won't turn in the ignition due to a locked steering wheel, a worn key or ignition cylinder, or an incorrectly parked gear shift. To fix this, first try turning the steering wheel while gently trying to turn the key to release the lock, then lubricate the ignition cylinder with a graphite-based lubricant. If that fails, consider the possibility of a worn key or a failing ignition cylinder, which may require a replacement key or ignition cylinder, respectively. 
Initial checks and fixes 
This video demonstrates how to unlock the steering wheel and ignition: 55sproclaimliberty2000YouTube · Sep 28, 2018

• Check the steering wheel lock: The steering wheel can lock the ignition. While holding the key in the ignition, gently turn the steering wheel from side to side to release the pressure. This will allow the key to turn. 
• Ensure the gear shifter is in the correct position: The vehicle will not start if the gear shift is not securely in the "Park" or "Neutral" position. Try wiggling the shifter to ensure it's fully engaged. 
• Lubricate the ignition cylinder: If the steering wheel isn't locked, the ignition cylinder may be worn or dirty. Spray a powdered graphite lubricant into the keyhole, then insert the key and try turning it again. Avoid oil-based lubricants like WD-40, as they can attract dirt. 
• Try a spare key: If you have a spare key, try using that one. The original key may be worn down and no longer working correctly. 

When to consider replacement parts
This video demonstrates how to use the key to start the car when the fob battery is dead: 59sPerformance Lexus Northern KentuckyYouTube · Feb 6, 2018

• Worn ignition key: If the key is noticeably worn, a new key can be cut from the car's VIN at a dealership. This is a relatively inexpensive test to rule out a worn key. 
• Worn ignition cylinder: If the above steps fail, the ignition lock cylinder itself may be worn or jammed. The cylinder may need to be replaced. A new cylinder purchased from a dealer will come with new keys, meaning your old keys will no longer work with that lock. 

Why when I put my key in the ignition, it won't turn?

A key that won't turn in the ignition is often caused by a locked steering wheel or the gear shifter not being fully in "Park" or "Neutral". Other common issues include a worn or bent key, a jammed ignition cylinder due to debris or a broken internal part, or a dead battery. 
This video demonstrates how to unlock the steering wheel and turn the key: 49sChris NotapYouTube · Jun 5, 2025
Common solutions

• Unlock the steering wheel: This is the most frequent cause. Apply slight pressure to the steering wheel in both directions while gently turning the key. 
• Check the gear shift: Ensure the car is fully in Park (for automatic) or Neutral (for manual). 
• Check the battery: A dead or weak battery can prevent the ignition from turning. Check your battery terminals for corrosion. 

Other potential issues and fixes

• Worn or bent key: The edges of the key may be worn down, preventing it from aligning with the ignition cylinder tumblers. Try pulling the key out slightly and re-inserting it, or try using a spare key if you have one. 
• Debris in the ignition cylinder: Dirt, debris, or a broken internal part can jam the cylinder. Try lubricating it with a silicone-based spray, and avoid using oil, as it can attract more dirt. 
• Worn-out ignition cylinder: Internal components can wear down over time. If other solutions don't work, you may need to replace the ignition cylinder. This is a job for a professional. 
• Heavy key ring: A heavy key ring can put pressure on the ignition and cause it to stick. Try removing some keys from the ring. 

How to fix jammed steering lock on Lexus?

Locked Steering Wheel: You can unlock the steering wheel by turning the steering wheel from left to right while simultaneously turning the ignition key on.

What is the common problem of the Lexus RX300?

Problem: The automatic boot motor is known for failing on the RX300. If you notice that the automatic boot makes a clunking noise when you press the button to open or close it, this indicates the motor is starting to fail. If the boot does not open at all, then the motor has completely failed.