[Closed] My 2021 Lexus RX 4 door key fob works, but car won’t start - code issue?

1932 views - Last reply: October 29, 2024
This topic is closed for new replies.
Killerbee
Member since January 2023 • 74 posts

Looking for my 2021 Lexus RX 4 door's key code to program a new key fob

Posted on October 29, 2024
Adminbot
Staff Member • 1333 posts

Hello! We've developed a VIN-based tool to help you get your key code for the 2021 Lexus RX 4 door. Check it out here: VIN Key Code Generator.

Posted on October 30, 2024

Replies (4)

Darkknight
Member • 117 posts

Same problem on my 2021 Lexus RX 4 door. Watching for any working solutions.

October 30, 2024 Reply
Shadowfax
Member • 41 posts

This trick worked for my buddy's 2021 Lexus RX 4 door. Giving it a go myself.

October 31, 2024 Reply
Ninjastar
Member • 20 posts

This looks helpful for those of us with a locked-out 2021 Lexus RX 4 door.

November 01, 2024 Reply
Lightspeed
Member • 42 posts

Thanks! This could save me a trip to the dealership for my 2021 Lexus RX 4 door.

November 02, 2024 Reply

Check the news !

Lowrider Spectacular
🚙 Local Meetup: Lowrider Spectacular
No trophies, just cool cars and cool people

🏁 Where: Community College Campus
📆 When: May 14 @ 11AM-7PM

Event features:
Cruise Night | Raffle Prizes | Food Trucks

⚙️ Forum Members: Forum staff will be there - come say hi! ✨

🧰 Detailing Like a Pro

👨‍🏫 Instructors:
• Safety Inspector Robert Yang
• Suspension Guru David Klein

🔌 Hands-On Activities:
• Live engine tuning session
• 6-hour intensive training
• Personal coaching

📅 Skills Covered:
Gear patterns | Bearing preload | Locker installation

🚙 May 11, 2026 at 11:00 AM (6-hour)

✨ Early registrants get preferred work bay access!

Workshop: Detailing Like a Pro
Suspension Tuning for Speed

🚀 Suspension Tuning for Speed

⚙️ Instructor: Factory ECU Engineer Dr. Sophia Chen

📊 Workshop Includes:
• Hands-on ECU flashing sessions
• 4-hour intensive hands-on training
• Cam profiles | Compression ratios | Octane requirements

🔩 Bonus: Entered into performance parts giveaway

🏎️ Next Session: May 14, 2026 at 9:00 AM

Customize Your Tuning Focus:

🚀 Performance Mod Cost Estimator

Did you know? Proper tuning can add 20-30% more power from the same hardware

Vehicle Information

Modification Information

Additional Options

🔑 Car Key & Fob FAQ

Common questions about key programming, fob issues, and replacement options

Lost Keys
Locksmiths or dealers can: 1) Decode your door or ignition lock to determine key cuts 2) Access your car's key code through manufacturer databases (with proof of ownership) 3) Program new transponder keys using diagnostic equipment.
Key Fob Issues
Many cars have a resync procedure: 1) Press lock/unlock buttons while near the car 2) Insert key and turn ignition on/off in a specific pattern 3) Use a sequence of button presses. Check your manual for exact steps - procedures vary widely by manufacturer.
Key Programming
Common reasons: wrong key type for your vehicle, anti-theft system needs reset, low car battery voltage during programming, or the key isn't properly synced. Some cars also have programming limits (only 2-4 keys can be registered).
Key Tip: Store your key code separately from your keys
Lost Keys
Yes, a skilled auto locksmith can extract the broken key and make a replacement. They can often do this without damaging the ignition cylinder. The new key will need programming if it has a transponder chip.
Key Tip: Newer cars often require dealer programming for first key replacement
Key Fob Issues
This typically indicates: weak fob battery (replace first), damaged fob antenna, or issues with your car's receiver (often in the door handle or rearview mirror). Environmental interference from other electronics can also reduce range.
Key Tip: Some locksmiths offer mobile key programming services
Key Fact: The average driver will lose 1-2 car keys during ownership

🔑 KEY SERVICES CLASSIFIEDS

Immobilizer System Reset
$95+
Posted: Apr 27, 2026
Fix "key not detected" errors and immobilizer issues. Dealer-level diagnostic equipment. Can often repair without replacing entire system. Free estimates.
Call: 311-224-6899
Transponder Key Duplication
$65+
Posted: Apr 23, 2026
Get spare keys made before you lose yours! Cuts and programs most transponder keys on the spot. Cheaper than dealerships. 15+ years experience.
Call: 873-916-9276
Key Fob Case Replacement
$35
Posted: Apr 27, 2026
Cracked or damaged fob housing? We transfer your electronics to a new case. Multiple color options available. Most models in stock. 15-minute service.
Call: 934-542-8793
Dealer Alternative Key Service
40% Less
Posted: Apr 24, 2026
Same quality as dealership without the markup. We have the same programming tools but charge significantly less. All major European, Asian, and domestic brands.
Call: 616-617-5759
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Seminar
May 26, 2026

Smart Key Programming Class

by Auto Key Masters
Hands-on experience with the newest transponder key cloning and programming equipment
Seminar
May 5, 2026

Transponder Key Tech Day

by Car Key Solutions
Learn dealer-level programming techniques normally only available at franchise shops
Workshop
May 13, 2026

Transponder Key Tech Day

by Auto Key Masters
Become certified in vehicle security systems with our intensive 2-day course
Seminar
May 22, 2026

Dealer-Level Programming Workshop

by Auto Key Masters
Learn dealer-level programming techniques normally only available at franchise shops

Need immediate service? Call our 24/7 hotline: 1-800-KEY-HELP

Want to list your key service? Join our provider network

Last posts on the forum