2020 Toyota RAV4 Serpentine Belt Routing, Length & Part Numbers

As an ASE-certified master technician, I regularly field questions about routine maintenance items on newer vehicles. The 2020 Toyota RAV4 (equipped with the standard 2.5L A25A-FKS 4-cylinder gas engine) is a highly reliable vehicle, but like any modern engine, its serpentine belt and auto-tensioner will eventually need replacement.

(Note: If you drive a 2020 RAV4 Hybrid, your vehicle uses an electric A/C compressor and electric water pump, meaning it does not have a traditional serpentine belt for these accessories.)

Here is your comprehensive guide to the 2020 Toyota RAV4 (Non-Hybrid) serpentine belt, including routing instructions, part numbers, and replacement tips.

Quick Answer: 2020 Toyota RAV4 Serpentine Belt Specs

If you are standing at the parts counter or ordering online, here are the exact specifications and part numbers you need for the 2.5L gas engine:

• Rib Count: 6-rib
• Belt Length: 48.5 inches (approximate)
• OEM Belt Part Number: Toyota 90916-02758 (or updated PN 90916-02759)
• Aftermarket Cross-References: Gates K060485, Dayco 5060485, Continental 4060485
• Auto-Tensioner Part Number: Toyota 16620-F0010 (Aftermarket: Gates 39420)
• Idler Pulley Part Number: Toyota 16603-F0010

Belt Routing Description

Because the 2020 RAV4 utilizes Electric Power Steering (EPS), there is no power steering pump pulley to worry about, making the routing slightly simpler than older generations.

Always take a clear photograph of your existing belt routing with your smartphone before you begin removal!

Text-Based Routing Path:

1. Start by looping the belt around the bottom of the Crankshaft Pulley.
2. Run the belt straight up from the front of the crankshaft to the A/C Compressor.
3. From the A/C compressor, route the belt over the top of the Alternator.
4. Bring the belt down from the alternator and loop it under the Water Pump pulley (smooth side of the belt against the smooth pulley, if applicable, depending on exact sub-model routing).
5. Finally, pull the slack over the Auto-Tensioner Pulley to complete the loop.

How to Replace the Serpentine Belt

Replacing the serpentine belt on the 2.5L engine is straightforward, but working space is notoriously tight on the passenger side of the engine bay.

Tools required:

• Serpentine belt tool or a long-handled 14mm / 3/8" drive breaker bar.
• Gloves and safety glasses.

Step-by-step process:

1. Locate the auto-tensioner on the passenger side of the engine block.
2. Place your serpentine belt tool or breaker bar onto the tensioner pulley bolt.
3. Rotate the tensioner counterclockwise (towards the front of the vehicle) to relieve the tension on the belt.
4. Slip the old belt off the easiest-to-reach pulley (usually the alternator or water pump).
5. Slowly release the tensioner and remove your tool. Route the old belt out of the engine bay.
6. Thread the new belt down through the engine bay, following the routing path described above. Leave the tensioner pulley for last.
7. Apply leverage to the tensioner once more, slip the new belt over the tensioner pulley, and carefully release the tensioner.
8. Crucial check: Inspect every pulley with a flashlight to ensure the belt ribs are perfectly seated in the pulley grooves. A misaligned belt will shred immediately upon startup.

Replacement Interval

For the 2020 RAV4, Toyota officially recommends inspecting the drive belt every 15,000 miles or 18 months. However, under normal driving conditions, the factory EPDM (Ethylene Propylene Diene Monomer) belt is designed to last between 60,000 and 90,000 miles. If your RAV4 operates in extreme heat, severe cold, or dusty conditions, expect to replace it closer to the 60,000-mile mark.

Signs of a Failing Belt or Tensioner

Don't wait for the belt to snap, which will leave you stranded without an alternator, water pump, or A/C. Look out for these warning signs:

• Squealing or Chirping: A high-pitched squeal on startup (especially on damp mornings) indicates a stretched belt or a weak auto-tensioner.
• Visible Wear: Look for missing ribs, deep cracks, or a shiny, glazed appearance on the ribbed side of the belt. (Note: Modern EPDM belts rarely crack like old neoprene belts; they wear deep into the grooves. Use a belt wear gauge if unsure.)
• Tensioner Rattle: If the tensioner arm is visibly bouncing or making a rattling/chattering noise while the engine is idling, the internal spring or dampener is failing.
• Overheating or Battery Warning Light: If the belt slips badly or breaks, the water pump and alternator will stop turning, triggering dashboard warnings.

If you don't feel comfortable tackling this job yourself, don't risk it. Find a trusted shop on Repairius to get your RAV4 back on the road safely.