Toyota Idler Pulley 16603-31040 4Runner Tacoma FJ Cruiser Tundra 4.0 V6 OEM
ToyotAuto Parts
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VERIFY COMPATIBILITY BEFORE PURCHASE

To ensure this idler pulley fits your specific vehicle and avoid costly returns, please message us your VIN number before purchasing. Our technical team will verify exact fitment within 24 hours. The 1GR-FE engine uses this pulley along with two No.2 pulleys (16604-31020) - let us confirm the full kit you need!

🔧 Product Overview

Part Number: 16603-31040
Replaced By: 16603-0P030 (current revision - same application)
Condition: Brand New - 100% Genuine Toyota OEM
Type: Drive Belt Idler Pulley Sub-Assembly No.1
Position: Upper (between PS pump & water pump / between compressor & crankshaft)
Quantity: Sold Individually (1 per vehicle)
Origin: Genuine Toyota OEM - Factory Sealed

✅ Vehicle Compatibility

US Market

Year Make Model Engine
2003-2009 Toyota 4Runner 4.0L V6 DOHC 1GR-FE
2007-2014 Toyota FJ Cruiser 4.0L V6 DOHC 1GR-FE
2005-2015 Toyota Tacoma 4.0L V6 DOHC 1GR-FE
2005-2010 Toyota Tundra (V6) 4.0L V6 DOHC 1GR-FE

International Market

Year Make Model Engine
2005-2015 Toyota Hilux (4.0L V6) 4.0L V6 DOHC 1GR-FE
2005-2015 Toyota Fortuner / SW4 (4.0L V6) 4.0L V6 DOHC 1GR-FE
2003-2015 Toyota Land Cruiser Prado (J120/J150 - 4.0L V6) 4.0L V6 DOHC 1GR-FE
2003-2009 Toyota Hilux Surf (N210/N215 - 4.0L V6) 4.0L V6 DOHC 1GR-FE

⚡ Note: This is the No.1 idler pulley exclusive to the 1GR-FE 4.0L V6 engine. The 1GR-FE also uses two No.2 idler pulleys (16604-31020). Toyota recommends replacing the belt, tensioner, and all idler pulleys together. Contact us for a complete accessory drive refresh kit.

Why Choose 100% Genuine Toyota OEM Parts?

✓ Precision Bearing Quality

OEM idler pulleys feature sealed, application-specific bearings designed for the exact speed and load requirements of the 1GR-FE V6 accessory drive system. Aftermarket pulleys often use generic bearings that fail prematurely.

✓ Eliminates Belt Noise & Vibration

A worn idler pulley causes squealing, chirping, and belt vibration. The OEM replacement restores smooth, quiet operation exactly as Toyota engineered it from the factory.

✓ Protects Critical Engine Systems

The idler pulley maintains proper tension on the serpentine belt that drives your alternator, A/C compressor, power steering pump, and water pump. A failed pulley can disable all these systems at once.

✓ Exact OEM Dimensions

Manufactured to exact Toyota specifications for diameter, bore, and belt tracking. Aftermarket pulleys with even slight dimensional variations can cause belt misalignment, premature wear, and catastrophic failure.

✓ Plug-and-Play Installation

Direct bolt-on replacement - no modifications or adapters needed. OEM pulleys include the correct dust shield and configuration for the 1GR-FE application, eliminating guesswork.

✓ Factory Warranty & Support

Backed by Toyota's 12-month warranty and our technical support team. We verify compatibility and help you identify the complete idler pulley kit for your specific vehicle.

📋 Important Information

✓ 100% Genuine Toyota OEM Part

This is NOT an aftermarket reproduction. Identical to parts sold at Toyota dealerships worldwide. Factory sealed packaging included.

⚙ī¸ Replace Belt, Tensioner & All Idler Pulleys Together

Toyota recommends replacing the serpentine belt (90916-02571), tensioner assembly (16620-31013), this No.1 idler pulley (16603-31040), and both No.2 idler pulleys (16604-31020 x2) at the same time. These components share the same service life. Contact us for a complete kit.

🔍 1GR-FE 4.0L V6 Only

This idler pulley is exclusive to the 4.0L V6 1GR-FE engine. If your vehicle has a different engine (2.7L 2TR-FE, 4.7L 2UZ-FE, etc.), it requires a different idler pulley. Contact us with your VIN for free verification.

đŸĸ About ToyotAuto Parts

We are Toyota and Lexus specialists based in Charlotte, North Carolina, serving enthusiasts and professional mechanics across the United States and internationally. Unlike generic auto parts sellers, we exclusively focus on genuine OEM Toyota and Lexus components.

Our mission is simple: provide authentic, factory-quality parts at competitive prices with technical support you won't find elsewhere. Every part we sell comes directly from Toyota's authorized supply chain - no knockoffs, no compromises.

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🚚 Shipping & Returns

đŸ“Ļ Shipping Information

  • Fast shipping from USA warehouse
  • Free 2-4 day delivery to most US addresses
  • Secure packaging to prevent damage
  • Same-day or next-day processing on most orders
  • Tracking number provided for all shipments

↩ī¸ Returns Policy

  • 30-day return window
  • Part must be unused and in original packaging
  • Buyer pays return shipping (unless our error)
  • Full refund once item is received and inspected
  • Message us before purchasing to verify fitment
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Questions? Need Fitment Verification?

Message us your VIN number and vehicle details - our technical team responds within 24 hours.
We'll help you build the complete accessory drive refresh kit!

📧 Contact ToyotAuto Parts Customer Service Team

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Specialists in Genuine Toyota & Lexus OEM Parts