2018 Lexus IS350 Key Won't Turn

Troubleshooting Steps to Resolve Ignition Issues with Your 2018 Lexus IS350 Key That Won't Turn

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
35% chance it's the
Binding Steering Column/Lock
0%
27% chance it's the
Ignition Switch
0%
20% chance it's the
Ignition Key
0%
18% chance it's
Something else
The most common reasons a 2018 Lexus IS350 key won't turn are a binding steering column/lock, an ignition switch issue, or a problem with the ignition key.
  • Binding Steering Column/Lock: A binding steering column or lock can occur due to a worn or damaged steering column assembly or issues with the ignition lock mechanism.
  • Ignition Switch: A faulty ignition switch can prevent the engine from starting or cause intermittent electrical issues, affecting the vehicle's ability to run properly.
  • Ignition Key: A worn or damaged ignition key or ignition cylinder can prevent the key from turning, leading to starting issues.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the steps to diagnose why the key won't turn in a 2018 Lexus IS350?

When diagnosing why the key won't turn in a 2018 Lexus IS350, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex issues. Start by examining the key itself for any signs of damage or excessive wear, as a compromised key can hinder ignition. Next, check the steering wheel; sometimes, the steering lock can engage, preventing the key from turning. While doing this, gently wiggle the steering wheel left and right to see if it releases the lock. Additionally, inspect the key fob's battery, as a weak or dead battery can interfere with the ignition process. If these initial checks do not resolve the issue, turn your attention to the ignition cylinder, which may be obstructed by dirt or debris, or could be faulty and in need of replacement. Ensure that the vehicle is in Park or Neutral, as some models require this specific gear position for the key to turn. If all else fails, it may be time to consult a professional mechanic who can conduct a thorough inspection of the ignition system to identify and rectify the underlying problem. By following this diagnostic approach, you can effectively troubleshoot the issue and determine the best course of action.

What are the common problems that could cause the key to not turn in the ignition of a 2018 Lexus IS350?

When facing the frustrating issue of a key that won't turn in the ignition of a 2018 Lexus IS350, it's essential to consider several common problems that could be at play. One frequent culprit is a locked steering wheel, which can prevent the key from turning; gently moving the steering wheel while attempting to turn the key may resolve this. Additionally, the key itself might be worn or damaged, so testing a spare key can help identify if the original is the issue. Another possibility is a malfunctioning ignition cylinder, which may require repair or replacement if it fails to engage properly. It's also crucial to check the vehicle's battery; a dead or weak battery can hinder ignition functionality, so ensuring it's charged is vital. Furthermore, a faulty ignition switch could be the source of the problem, necessitating inspection and potential replacement. Lastly, ensure that the transmission gear shift is correctly positioned in park or neutral, as an improper gear setting can also prevent the key from turning. By systematically addressing these potential issues, you can effectively troubleshoot and resolve the ignition problem.

How urgent is it to address the issue of a key that won't turn in a 2018 Lexus IS350?

Addressing the issue of a key that won't turn in your 2018 Lexus IS350 is not just a matter of convenience; it is a pressing concern that requires immediate attention. Ignoring this problem can lead to significant inconveniences, such as being unable to start your vehicle when you need it most, which can disrupt your daily schedule and cause unnecessary frustration. More critically, a stuck key can pose serious safety risks, especially in emergency situations where quick access to your vehicle is essential. Additionally, if the key mechanism fails completely, you could find yourself stranded in an unsafe or inconvenient location, further complicating your situation. Promptly addressing this issue not only ensures your immediate safety and convenience but also helps prevent potential damage to the ignition system, which could result in costly repairs down the line. Therefore, it is crucial to take action as soon as you notice any signs of trouble with your key.

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2018 Lexus IS350 Key Won't Turn - Common Causes & Fixes