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Idler Pulley

Critical For Operation

Engine

Guides and supports the serpentine belt, ensuring proper tension and alignment.

The idler pulley provides a smooth rotating surface for the serpentine belt, ensuring that the belt remains properly tensioned and aligned as it drives engine accessories like the alternator, water pump, and A/C.

💵
Typical part cost
$30–$100🔒
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Typical labor cost
$100–$250🔒
🛣️
Typically lasts
100,000–200,000 mi
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Or about
7.0–10.0 years
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DIY difficulty
4/10

⚠️ Owners Often Notice

If the Idler Pulley is starting to fail, these are the signs owners most commonly report before it gets worse:

Belt noise
Serpentine belt misaligned
Belt slipping

Related Services

Services commonly performed on or around this part.

Replace Idler Pulley

No standard interval on file

Inspect Idler Pulley

No standard interval on file