Drive Belt Idler Pulley 11287556251 for BMW 135i 335i X1 35i N55 2009-2015 E82 E88 E90 E92

Description

Maintain proper serpentine belt alignment and tension with this replacement drive belt idler pulley. Engineered for compatibility with BMW N55-powered vehicles including the 135i, 335i, and X1 35i across 2009-2015 model years.

Key Features

• Direct replacement for BMW part number 11287556251.
• Compatible with N55 engine models: 135i (E82/E88), 335i (E90/E92), X1 35i (2009-2015).
• Supports proper drive belt routing and tensioner system function.
• Precision-engineered for exact fitment on specified chassis codes.
• Manufactured to meet OEM quality standards for reliable operation.

Technical Specifications

Package Includes

• 1 x Drive Belt Idler Pulley

FAQ

Q: Will this fit my 2012 BMW 335i?

A: This pulley is designed for 2009-2015 BMW 335i models equipped with the N55 engine. Please verify your engine type and existing part number 11287556251 before ordering.

Q: Is this the tensioner pulley or the idler pulley?

A: This is an idler pulley (guide pulley) for the drive belt system, which guides the belt routing but does not provide tension adjustment.

Q: Does this include installation hardware?

A: This item typically includes the pulley only. Mounting bolts or hardware should be reused from your original installation or sourced separately.

Q: What happens if the idler pulley fails?

A: A failed idler pulley can cause belt misalignment, squealing noises, or complete belt failure. Replacement is recommended at the first sign of bearing noise or wobble.