Standard Ignition AC425 Idle Air Control Valve
OE Quality 60-Day Returns
Standard Ignition

Standard Ignition AC425 Idle Air Control Valve

Brand Standard Ignition AC425
Terminal Type Blade
Fits Lexus and Toyota · 21 vehicles

Idle air control valve. Regulates airflow to help maintain a steady idle.

Female connector. Single 6-blade terminal connection for straightforward replacement.

Cross-references Standard Ignition AC425, 2-19376 and 29907 for the same application. See all 5.

$468.53Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $468.53
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Idle Air Control Valve options

Idle Air Control Valve for Lexus and Toyota

Standard Ignition AC425 is an idle air control valve for select Lexus and Toyota applications with Federal Emissions. It is used on vehicles such as the Lexus GS300, Lexus SC300, and Toyota Supra where precise idle airflow control is required for stable engine operation.

  • Female connector gender with 1 connector
  • 6 male blade terminals for the electrical connection
  • Direct-fit idle air control valve for Federal Emissions applications
  • Primary or auxiliary air valve use depending on vehicle and model year
  • Standard Ignition AC425 replacement for OE-style service

Fitment Details

  • Fits 1993-1996 Lexus GS300, N/A, w/ Federal Emissions: Auxiliary Air Valve
  • Fits 1996 Lexus SC300, N/A, To 8/95; Primary
  • Fits 1994-1996 Lexus SC300, N/A, w/ Federal Emissions: Auxiliary Air Valve
  • Fits 1994-1995 Lexus SC300, N/A, Idle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
  • Fits 1993-1995 Toyota Supra, N/A, Idle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
  • Fits 1994-1995 Toyota Supra, N/A, w/ Federal Emissions: Auxiliary Air Valve
  • Fits 1993-1994 Lexus GS300, N/A, Idle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
  • Fits 1992-1993 Lexus SC300, N/A, Primary application for specific vehicle models ~ Idle Air Control Valve
  • Fits 1992-1993 Lexus SC300, N/A, Compatible with various car models.

What This Part Helps Address

  • Unstable or fluctuating idle speed
  • Idle speed that is too high or too low
  • Stalling when the engine returns to idle
  • Idle control issues on Federal Emissions-equipped Lexus and Toyota models
  • Airflow control faults related to the idle air control system

Installation Notes and Tips

Verify the connector style, terminal count, and emissions configuration before installation. This Standard Ignition AC425 uses a female connector with 6 male blade terminals, so matching the electrical interface and the vehicle’s Federal Emissions setup is important for correct fitment. Confirm whether your application uses the primary or auxiliary air valve configuration on Lexus GS300, Lexus SC300, or Toyota Supra models.

This part cross-references AC4028 for the same application.

Quality Assurance

Standard Ignition is a recognized aftermarket brand for engine management and fuel delivery components. AC425 is cataloged for specific Lexus and Toyota idle air control applications to support accurate replacement selection.

Related reading

This part fits 21 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
1996LexusGS3003.0LL6N/Aw/ Federal Emissions: Auxiliary Air Valve
1996LexusSC3003.0LL6N/ATo 8/95; Primary
1996LexusSC3003.0LL6N/Aw/ Federal Emissions: Auxiliary Air Valve
1995LexusGS3003.0LL6N/Aw/ Federal Emissions: Auxiliary Air Valve
1995LexusSC3003.0LL6N/AIdle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
1995LexusSC3003.0LL6N/Aw/ Federal Emissions: Auxiliary Air Valve
1995ToyotaSupra——N/AIdle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
1995ToyotaSupra3.0LL6N/Aw/ Federal Emissions: Auxiliary Air Valve
1994LexusGS3003.0LL6N/AIdle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
1994LexusGS3003.0LL6N/Aw/ Federal Emissions: Auxiliary Air Valve
1994LexusSC3003.0LL6N/AIdle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
1994LexusSC3003.0LL6N/Aw/ Federal Emissions: Auxiliary Air Valve
1994ToyotaSupra——N/AIdle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
1994ToyotaSupra3.0LL6N/Aw/ Federal Emissions: Auxiliary Air Valve
1993LexusGS3003.0LL6N/AIdle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
1993LexusGS3003.0LL6N/Aw/ Federal Emissions: Auxiliary Air Valve
1993LexusSC3003.0LL6N/APrimary application for specific vehicle models ~ Idle Air Control Valve
1993LexusSC3003.0LL6N/ACompatible with various car models.
1993ToyotaSupra——N/AIdle Air Control Valve fits vehicles with Federal Emissions and is the primary option.
1992LexusSC3003.0LL6N/APrimary application for specific vehicle models ~ Idle Air Control Valve
1992LexusSC3003.0LL6N/ACompatible with various car models.
Directly replaces or cross-references 5 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Standard Ignition — AC4252-19376299072227046050AC4028