URO 31121139987 Suspension Control Arm - Front Left Lower

BMW Front Left Lower Control Arm

This URO suspension control arm, part number 31121139987, is built for BMW front-end service where precise wheel control matters. It is a direct-fit replacement for the front left lower position on select BMW 5 Series, 7 Series, and M models, including BMW 525i, 535i, and M5 applications.

Key Features

• Front left lower suspension control arm for confirmed BMW fitment
• High-strength alloy metal construction for durability
• OE control arm geometry for correct wheel alignment and directional control
• Ball joint included with bolt-in mounting and threaded stud design
• Pre-greased, non-greaseable design with no grease fitting
• Bushings included for a complete replacement assembly
• Neoprene dust boot helps protect the ball joint from dust and water
• 24 month unlimited mileage warranty

Detailed Description

URO part number 31121139987 is a front left lower control arm engineered for BMW suspension repair where steering response, braking stability, and alignment accuracy are critical. It is manufactured to OE control arm geometry and uses a high-strength steel ball joint housing with a metal bearing surface for consistent fit and function. This BMW control arm is listed for aluminum wishbone applications and is referenced across multiple OE-style replacement numbers, including Beck/Arnley 102-4127 and Dorman OE Solutions 520-575.

Compatible With BMW 525i, 530i, 540i, 740i, 740iL, 750iL, 535i, M5, 735i, 735iL, 528e, 535is, 524td, and 533i front left lower suspension positions. If you are replacing a worn BMW front left lower control arm, 31121139987 is built to restore proper wheel alignment and directional control.

What It Helps Fix

• Front-end looseness or wandering during driving
• Uneven tire wear caused by suspension geometry issues
• Clunking or play from a worn control arm or ball joint
• Reduced braking stability under load
• Steering pull or poor directional control

Installation Notes and Tips

Verify the vehicle’s suspension configuration before ordering, especially on BMW aluminum wishbone applications. This control arm is pre-greased and does not use a grease fitting, so no routine greasing is required. Because suspension geometry affects alignment, a professional wheel alignment should be performed after installation. Confirm the front left lower position and match the threaded ball stud and bolt-in mounting style to the original part.

Quality Assurance

URO backs this control arm with a 24 month unlimited mileage warranty. The part is built for guaranteed fitment and manufactured to OE-style geometry to support correct suspension operation on the listed BMW applications.