89661-3A541 OEM ECU W/ Programmed Master Key Lexus GS400
89661-3A541 OEM ECU W/ Programmed Master Key Lexus GS400
89666-30132 OEM ECU W/ Programmed Master Key Lexus GS300
Compatible: 1999 Lexus LS400 OEM Part Number: 89661-50501 | 8966150501 | 175200-3410 | 1752003410
Compatible: 2005 Lexus GS430 OEM Part Number: 89661-30A70 | 8966130A70 | 275100-1850 | 2751001850

89661-3A541 OEM ECU W/ Programmed Master Key Lexus GS400


Check out our replacement OEM Denso ECU with included programmed master key!

Compatible: 1999 Lexus GS400

OEM Part Number: 89661-3A541 | 896613A541 | 175200-3450 | 175200-3450

(See description for more details)

SKU WKUS-W-53530|89661-3A541 Categories ,


Compatible: 1999 Lexus GS400

OEM Part Number: 89661-3A541 | 896613A541 | 175200-3450 | 175200-3450

Looking for a plug and play replacement 89661-3A541 ECU? 

Want to avoid costly dealer only replacements that cost a fortune? 

We can help! 

This engine control unit (ECU) will include a new, 4C transponder master key that has been programmed to the computer’s immobilizer system.

No additional programming required!

Simply purchase the unit by clicking the Buy Now button above, you will receive an ECU with programmed master key within 4- 8 business days.

VIN programming is also included, please include your VIN in the order notes during checkout.


The key we provide will need to be cut by a local locksmith or dealer, this can be done for around $40 using your VIN. (We do not cut keys.)

Our tested, pre-owned OEM units include a hassle free 2-year warranty.

Free shipping is included with a package tracking number.

The key shown in the photos is the exact key you will receive.

Part numbers are important, be sure to order a replacement that matches your original part number.

If you need a unit and are outside the United States, please reach out to us via email with your address for a shipping quote.

We do not offer Express shipping at this time.

Supplies may be limited.

Technician’s Notes: 

In many modern vehicles, components are equipped with a theft deterrent called an immobilizer system.

The Lexus GS400 was equipped with an immobilizer system starting with its second generation (S160) models.

If the key doesn’t match with the ECU – the immobilizer system will not allow your vehicle to start.

Each key we program to the unit is unique. Your original keys will no longer work with this unit, only the key we provide will start the vehicle.

If you plan on replacing your ECU – our programmed key/ECU combo is the perfect solution.

Some common symptoms of a bad ECU include:

  • Rough idle
  • Cylinder misfire
  • Poor acceleration
  • Not found via OBD
  • A/C no longer functions
  • Failure or difficult to start
  • Fault codes that will not clear
  • Transmission shifting problems

Included Key Specs

  • Keyless Entry: 3 Button Remote
  • Program Type: Master Key
  • Transponder: 4C
  • Battery Included
  • Blade: 42mm / Short
  • Condition: NEW
  • Remote ID: HYQ1512V

Other acronyms for the Engine Computer: ECU Engine Control Unit – ECM Engine Control Module – BCM Body Control Module – PCM Power Control Module

We understand for some, a vehicle is part of the family. Our mission is to get your vehicle back on the road by offering quick and cost-effective solutions.

If you have any questions about this unit or anything else, please do not hesitate to reach out to us!

-Module Mechanics

Additional information







Part Number

89661-3A541, 175200-3450

Other Part Numbers

896613A541, 1752003450

Lexus Key Options

1 Master Key, 1 Master Key with Lexus Logo, 2 Master Keys, 2 Master Keys with Lexus Logo

  • 2 Year Money Back Guarantee


Our mission is providing unique and cost saving solutions to combat the automotive industries problematic electronic issues, keeping you in your car, not your wallet. 

You're viewing: 89661-3A541 OEM ECU W/ Programmed Master Key Lexus GS400 $389.95$479.95
Rated 0 out of 5
Select options
Select the fields to be shown. Others will be hidden. Drag and drop to rearrange the order.
  • Image
  • SKU
  • Rating
  • Price
  • Stock
  • Availability
  • Add to cart
  • Description
  • Content
  • Weight
  • Dimensions
  • Additional information
  • Attributes
  • Custom attributes
  • Custom fields
Click outside to hide the compare bar
Compare ×
Let's Compare! Continue shopping

Our Shipping Address

Module Mechanics

6732 W. Coal Mine Ave, STE 511, Littleton, CO 80123

*Please include your name or order number with the shipment

Everything You Need!
If you have any question, please contact us at info@modulemechanics.com
Shopping cart close