URO 31121139999 Suspension Control Arm - Front Left Upper

BMW Front Left Upper Control Arm

This URO suspension control arm is built for the front left upper position on select BMW 7 Series and 8 Series models. It is engineered to restore suspension geometry, steering response, and braking stability while supporting correct wheel alignment.

• Fits the front left upper suspension position
• Pre-greased with a sealed ball joint assembly
• Ball joint included with threaded stud design
• Bushings included for direct replacement service
• High-strength alloy metal construction for durability
• OE control arm geometry for proper alignment and directional control
• Neoprene dust boot helps protect the joint from dust and water
• 24 Month Unlimited Mileage Warranty

Detailed Product Overview

Part number 31121139999 is a URO suspension control arm designed to match OE-style geometry for accurate suspension positioning. It is a direct-fit front left upper control arm for BMW 735i, 735iL, 740i, 740iL, 750iL, 840Ci, 850Ci, 850CSi, and 850i applications listed below. The bolt-in ball joint, metal bearing material, and high-strength steel housing support stable operation in demanding front suspension service. Part number 31121139999 is also cross-referenced with Beck/Arnley 102-5101 for the same application.

Compatible With: Fits 1987-1992 BMW 735i, front left upper; Fits 1988-1992 BMW 735iL, front left upper; Fits 1988-1994 BMW 750iL, front left upper; Fits 1991-1992 BMW 850i, front left upper; Fits 1993-1994 BMW 740i, front left upper; Fits 1993-1994 BMW 740iL, front left upper; Fits 1993-1997 BMW 850Ci, front left upper; Fits 1994-1995 BMW 850CSi, front left upper; Fits 1994 BMW 840Ci, front left upper; Fits 1995 BMW 840Ci, front left upper; Fits 1996-1997 BMW 840Ci, front left upper.

What This Control Arm Helps Address

• Loose or imprecise front-end steering feel
• Uneven tire wear caused by suspension geometry issues
• Clunking or play from a worn upper control arm assembly
• Braking instability from worn suspension components
• Alignment problems after front suspension wear

Installation Notes and Tips

Verify the front left upper position and confirm the ball joint orientation before installation; the listed BMW applications note a ball joint that faces down. This control arm uses a threaded ball joint stud with an M14x1.50 thread size and a 22 mm nut wrench size. Confirm the vehicle’s existing bushing configuration against the notes for your exact model year before installation.

Quality Assurance

URO backs this control arm with a 24 month unlimited mileage warranty. The part is manufactured to OE control arm geometry and built from high-strength alloy metal to support consistent fitment and suspension performance on BMW 7 Series and 8 Series applications.