Toyota Sienna Timing Belt Idler Pulley Replacement Cost

Know what price you should pay to get your vehicle fixed.

The average cost for a Toyota Sienna timing belt idler pulley replacement is between $483 and $675. Labor costs are estimated between $439 and $554 while parts are priced between $44 and $121. Estimate does not include taxes and fees.
Note about price: This service is typically done as part of a bigger, more expensive repair, so the estimate you see above may not represent your total cost. Some of these bigger related repairs are listed in the table below. Talk with a RepairPal Certified shop to learn which repairs may be right for you.

How does a Timing Chain Idler Pulley work?

The idler pulley is bolted through the center into the engine, and the smooth side of the timing belt turns the pulley to reduce friction and heat.

What are the symptoms of a bad Timing Chain Idler Pulley?

If the idler pulley fails, there will be a very audible chirping noise from the front of the engine. This is because the idler pulley bearing is no longer smooth. If it is not changed immediately, the engine will being running roughly, or stall completely, and internal engine damage may occur due to slippage or breakage of the timing belt. The check engine light will illuminate on the dashboard in the event of total failure, and OBD trouble codes for misfires, crankshaft position, and camshaft position will be stored.

Can I drive with a bad Timing Chain Idler Pulley?

It is not recommended to drive a vehicle suspected of idler pulley bearing failure. This can quickly result in complete engine failure as described above.

How often do Timing Chain Idler Pulleys need replacement?

Timing belt idler pulleys are replaced during a timing belt replacement service, either as preventive maintenance or due to suspected failure. This means the average idler pulley replacement occurs between 60,000 and 105,000 miles, depending on the manufacturer specified timing belt service interval.

How are Timing Chain Idler Pulleys replaced?

At a minimum, replacement involves removal of the timing cover, timing belt tensioner, timing belt, and, finally the timing belt pulley. When this service is performed, it is common to replace the timing belt, water pump, and seals. Once all components are replaced, the timing components can be installed onto the engine, and the engine will be tested for proper operation and timing.

RepairPal Recommendations for Timing Chain Idler Pulley issues

Since this service requires removal of the timing belt, it is recommended to replace the timing belt, water pump, and possibly front seals at the same time, unless they have been recently serviced. This is much more cost effective than returning for the same service after a partial service interval has elapsed.

What to look out for when dealing with Timing Chain Idler Pulley issues

Some engines use more than one timing belt idler pulley, which affects the cost of the repair slightly. The pulley can fail at random, especially if debris is pinched between the timing belt and the idler pulley. It may be necessary for the motor mounts to be removed from the vehicle, as well as engine cooling fans, the radiator, and all engine accessories.

Can I replace the Timing Chain Idler Pulley myself?

Since timing belt idler pulley replacement necessitates the removal of timing components, it is not recommended for the DIYer to attempt this task. A thorough knowledge of internal engine components, engine timing, and several specialty tools are required to properly perform this repair.

Timing Belt Idler Pulley Replacement Cost Estimates

The average cost for a Timing Belt Idler Pulley Replacement is between $483 and $675 but can vary from car to car.