[Resolved] 1989 Mitsubishi Montero immobilizer code invalid - what now?

4869 views - Last reply: November 22, 2024
This topic is closed for new replies.
Cosmicray
Member since August 2021 • 91 posts

How to find the factory key code to program 1989 Mitsubishi Montero keys?

Posted on November 22, 2024
Adminbot
Staff Member • 738 posts

Hello! We've developed a VIN-based tool to help you get your key code for the 1989 Mitsubishi Montero. Check it out here: VIN Key Code Generator.

Posted on November 23, 2024

Replies (4)

Ultraman
Member • 66 posts

My 1989 Mitsubishi Montero's been in the garage for a week over this. Thanks!

November 23, 2024 Reply
Happyfeet
Member • 122 posts

Thanks! Been struggling with this on my 1989 Mitsubishi Montero for a while.

November 24, 2024 Reply
Zerocool
Member • 49 posts

I really hope this trick works on my 1989 Mitsubishi Montero.

November 25, 2024 Reply
Misterx
Member • 85 posts

I tried this trick and it actually worked on my 1989 Mitsubishi Montero!

November 26, 2024 Reply

Check the news !

JDM Enthusiasts Meet
🏎️ Local Meetup: JDM Enthusiasts Meet
The local meetup for serious enthusiasts

🗺️ Where: Industrial Park
⏰ When: May 24 @ 10AM-6PM

Event features:
Photoshoot Area | Ride-Alongs

🔩 Forum Members: Post in the thread to reserve your spot! 👍

🧰 Electrical Diagnostics Lab

👨‍🏫 Instructors:
• Master Technician Carlos Rodriguez (20+ years experience)
• Custom Fabricator Mike 'Wrench' O'Connor

🔌 Hands-On Activities:
• Complete brake system overhaul demo
• 4-hour intensive training
• Personal coaching

📅 Skills Covered:
Metal finishing | Bondo application | Rust treatment

🚙 May 28, 2026 at 9:00 AM (4-hour)

✨ Limited to 15 participants - reserve your spot now!

Workshop: Electrical Diagnostics Lab
Suspension Tuning for Speed

🏁 Suspension Tuning for Speed

🔧 Instructor: Pro Drag Racer Jake 'The Snake' Reynolds

💻 Workshop Includes:
• Data interpretation techniques
• 4-hour intensive hands-on training
• Exhaust scavenging | Header design | Backpressure

📈 Bonus: Exclusive tuner network discounts

⏱️ Next Session: May 20, 2026 at 2:00 PM

Customize Your Tuning Focus:

🚀 Performance Mod Cost Estimator

FYI: Many performance shops offer package deals for common upgrade paths

Vehicle Information

Modification Information

Additional Options

🔑 Car Key & Fob FAQ

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

Security Systems
A flashing security light often indicates an immobilizer issue. Solid light suggests the system is armed but not recognizing your key. Causes: faulty key chip, damaged antenna ring, low battery, or system needs reprogramming.
Key Tip: Avoid exposing key fobs to water or extreme temperatures
Lost Keys
1) Contact a locksmith who specializes in automotive keys or your dealership 2) Provide proof of ownership (registration, title, ID) 3) They'll either cut new keys by code or reprogram your car's system 4) This is expensive ($200-$800) as the immobilizer may need resetting.
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).
Lost Keys
Costs vary widely: Basic keys: $50-$150, Transponder keys: $150-$300, Smart keys/fobs: $200-$800, Dealership replacements typically cost 20-50% more than locksmiths. Emergency/lockout service adds $50-$150.
Key Programming
Professional key programming requires: diagnostic tools to access the immobilizer system, key code software, transponder programmers, and often proprietary manufacturer equipment. Some locksmiths and all dealers have these tools.
Key Fact: Some insurance policies offer key replacement coverage

🔑 KEY SERVICES CLASSIFIEDS

Immobilizer System Reset
$95+
Posted: May 12, 2026
Fix "key not detected" errors and immobilizer issues. Dealer-level diagnostic equipment. Can often repair without replacing entire system. Free estimates.
Call: 464-408-7715
Fleet Key Programming
Call
Posted: May 4, 2026
Commercial key services for businesses with multiple vehicles. Bulk discounts available. We can handle all your company cars, trucks, and fleet vehicles.
Call: 372-921-7171
Vintage Car Key Restoration
$55+
Posted: May 13, 2026
Specializing in classic car keys (pre-1990). Can reproduce hard-to-find keys for antique vehicles. Museum-quality work for collector cars.
Call: 434-512-3113
Dealer Alternative Key Service
40% Less
Posted: May 14, 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: 928-681-1057
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Seminar
May 16, 2026

Anti-Theft System Demonstration

by VIN Decoder Pros
In-depth class covering push-to-start systems and proximity key programming techniques
Workshop
May 19, 2026

Immobilizer System Seminar

by Auto Key Masters
Live demonstration of the latest anti-theft technologies and bypass prevention methods
Seminar
Jun 12, 2026

Anti-Theft System Demonstration

by Car Key Solutions
Live demonstration of the latest anti-theft technologies and bypass prevention methods
Seminar
Jun 5, 2026

Transponder Key Tech Day

by VIN Decoder Pros
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