🔧 Serpentine Belt - Replacement

The serpentine belt drives the alternator, water pump, and other accessories. On your Yaris, replacement is straightforward, but belt routing and tensioner movement need to be done carefully so the new belt seats correctly.

Difficulty Level: Beginner | Estimated Time: 0.5-1 hour

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⚠️ Safety & Precautions

• Work with the engine completely off and cool.
• Keep hands, hair, and clothing away from the belt path.
• Do not start the engine until the belt is fully seated on every pulley.
• If the battery is disconnected, you may need to reset the radio clock and presets.
• Take a photo of the belt routing first.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch drive ratchet
• 14mm socket
• Breaker bar
• Flashlight
• Safety glasses
• Mechanic gloves
• Wheel chocks
• Floor jack (rated 3-ton minimum)
• Jack stands

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Put the transmission in neutral, then shut the engine off.
• If you need better access from below, raise the front and support it with jack stands.
• Never rely on the jack alone.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the belt and tensioner

• Open the hood and find the serpentine belt at the front of the engine.
• Look for the belt tensioner pulley. This is the spring-loaded arm that keeps the belt tight.
• Use a flashlight to trace the belt path before removing anything.

Step 2: Release belt tension

• Use the 14mm socket and breaker bar on the tensioner bolt or hex fitting.
• Rotate the tensioner in the direction that unloads the belt.
• Move slowly and keep control.

Step 3: Remove the old belt

• While holding the tensioner released, slip the belt off the easiest accessible pulley.
• Slowly let the tensioner return to its resting position.
• Remove the belt from the rest of the pulleys by hand.

Step 4: Compare the new belt

• Lay the new belt next to the old one and compare length and rib count.
• Make sure the new belt matches exactly before installing it.

Step 5: Route the new belt

• Route the new belt around all pulleys except one easy-access pulley.
• Keep the ribbed side of the belt seated in the pulley grooves.
• Use the belt routing diagram under the hood if present.

Step 6: Finish seating the belt

• Use the 14mm socket and breaker bar to release the tensioner again.
• Slip the belt onto the last pulley.
• Slowly release the tensioner and confirm the belt sits fully in every pulley groove.

Step 7: Inspect the installation

• Use a flashlight to check that the belt is centered on every pulley.
• Spin each accessible pulley by hand only if the engine is off and the belt is loose enough to do so safely.
• Make sure the belt is not twisted.

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✅ After Repair

• Start the engine and listen for squealing or chirping.
• Watch the belt for a few seconds to confirm it tracks straight.
• If you hear noise, shut the engine off and recheck the routing.
• Check again after a short drive for proper seating.

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💰 DIY vs Shop Cost

Shop Cost: $120-$220 (parts + labor)

DIY Cost: $25-$55 (parts only)

You Save: $95-$165 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1 hour.

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🎯 Ready to get started?

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