Transfers rotational power from the engine crankshaft to drive multiple accessories simultaneously: alternator, power steering pump, air conditioning compressor, and often the water pump.
$100 – $250
Total Cost
60,000 – 100,000 miles
Replace Interval
Moderate
DIY Difficulty
Fix Within a Week
If It Fails
The serpentine belt is a single, long belt that drives multiple engine accessories including the alternator, power steering pump, AC compressor, and water pump. It's one of the most critical maintenance items — when it breaks, everything it drives stops working.
Parts Cost
$25 – $60
Labor Cost
$50 – $150
Replace at the manufacturer's recommended interval (60,000-100,000 miles), or immediately if you see cracks, fraying, or hear persistent squealing.
Some Honda models use two shorter belts instead of a single serpentine belt. Check your specific model.
BMW serpentine belts should be replaced every 60,000 miles. The routing can be complex — take a photo before removal.