Took my 2006 land rover lr3 into shop for front lower rear control arm bushings. when I left the shop driving along all of a sudden car lowered and I got an air suspension fault light come on. never had a problem with this before

The ball joints are part of the lower control arm . The control arm is not extremely difficult, but not easy either. First remove the nut on balljoint, then pull the ball joint out of the knuckle, that may take a pry bar, remove front control arm nut and bolt, and two bolts on rear of control arm bushing, reverse process to install. The Ford workshop manual says to replace the control arm nuts and bolts, but I hardly ever do. Have never had a problem. Torque front bolt to 111 lb-ft, and rear to 73 lb-ft. Hope that is good for you.
KIP. Martin, service manager Ford dealership.

opper Control Arm Bushings

• To access the upper control arm, remove the shock absorber and the strut bar. Also, disconnect the sway bar from the lower control arm, if your particular Ram model is equipped with it. After that, you can hold the coil spring in place with a spring compressor.
  Secure the wheel hub assembly to the chassis using a wire before you disconnect the upper ball joint. This will prevent damage to the brake hose. When ready, release the ball joint using a ball-stud loosening tool (see Resources).
  The upper control arm mounts to the chassis with a cam bolt assembly. Once removed, you can place the control arm on a vise and remove the bushings using a bushing service tool (see Resources). When installing the new bushings, do not use any lubricant but make sure the flange on the bushing end seats properly on the arm bore. Then re-install the upper control arm. When finished, take your Dodge vehicle to a good shop to align the front suspension.
  

Lower Control Arm Bushings

• Remove the shock absorber and strut bar. If your particular model is equipped with a sway bar, disconnect it from the lower control arm.
  Secure the coil spring with a spring compressor and release the lower ball joint from the wheel/hub assembly using a ball stud loosening tool (see Resources).
  Now you can release the lower control arm by removing the rear mounting bolts. Remove the bushings with a bushing service tool (see Resources). When installing the new bushings, do not use lubricant and make sure they seat properly on the control arm bore. Then replace the lower control arm. When finished, take your Dodge vehicle to a good shop to align the front suspension
  

Broken stabalizer links, broken stabilizer bar, and worn out stabilizer bar bushings are fairly common. As well as the rear bushings on the front lower control arms. A quick inspection of the front end and you should be able to tell if the links are bad, bar is broken, or the lower control arm bushings are separated. If the rear bushings on the front lower control arms are seperated the lower control arm will look like it is resting on the subframe.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Did you take it to a rover dealer?. If not, it may be worth it.

good luck

LOWER CONTROL ARM

REMOVAL
1) Raise and support vehicle. 3) Remove the steering knuckle.
Remove the bolts fastening the power steering cooler to the front suspension cradle crossmember reinforcement (Fig. 21). 5) Remove the lower control arm rear bushing retainer bolts located on each side of each lower control arm rear bushing. NOTE: The bolts fastening the cradle crossmember reinforcement are of three different thread sizes. Note the location of the various sizes.

6) Remove the bolts attaching the cradle crossmember reinforcement to the front suspension cradle crossmember (Fig. 22). Remove the 2 bolts fastening the reinforcement and rear of cradle crossmember to the body of the vehicle. Remove the reinforcement. 7) Remove the pivot bolt attaching the front bushing of the lower control arm to the front suspension cradle crossmember. 8) Remove the lower control arm.

I've done front end work. You may need a ball joint press, to remove the lower ball joint off the lower control arm and install or press the new one on. The upper ones you will have to chisel the the tops of the riviets off and drill though them unless they're on with nuts and bolts. It is easier to have the upper control arm off the car to do this also because the upper control bushings may need replacing also. You can get those off with a air chisel and on with a vise and a 5 pound sledge hammer and a sleeve on the bushing.(They make a bushing press which is better.) If you don't have air take the upper arms to a muffler shop. Before I had air, I took my arms to a local tire shop, he took the old ones off and put the new ones on for $20.

Very common BMW problem. The front lateral arms that support the front to rear motion of the wheel. BMW calls it the upper, lower support arm. Two arms connect there. one left to right (think typical lower control arm, and this arm) It has a ball joint that connects to the lower most part of the strut and extends rearward to the rear crossmember and has a large bushing pressed into the arm. You can replace just the bushing if the ball joint end is ok. Bushings are about $45 each and you will need a press.

This new five-passenger premium sport-utility vehicle filled a price gap between Land Rover's LR3 and its ultraluxury Range Rover models. In fact, the all-wheel-drive Range Rover Sport was smaller than either, designed to compete with "high-performance" SUVs such as V8 versions of the BMW X5 and Porsche Cayenne, as well as Cadillac's SRX. Based on the seven-passenger LR3's body-on-frame structure, the Range Rover Sport came as the HSE model with a 300-horsepower, 4.4-liter V8, and in Supercharged trim with a 390-horsepower, 4.2-liter V8. Both engines were sourced from Jaguar, which was owned by Land Rover's parent company, Ford. A six-speed automatic with manual shift gate was the sole transmission. All-wheel drive with low-range gearing was standard, and included Land Rover's Terrain Response system, designed to automatically tailor AWD performance to specific off-road conditions. Also included were a height-adjustable air suspension, antiskid/traction control, and antilock four-wheel disc brakes. The Supercharged model came with 20-inch wheels and Brembo-brand front brakes. On the HSE, 19-inch tires were standard and 20-inch optional. Both models contained front side airbags, head-protecting curtain side airbags, and a navigation system. Standard on the Supercharged model and available for the HSE were wood interior trim, heated seats, and Land Rover's Dynamic Response suspension system, designed to counteract body lean in turns. Satellite radio, wireless cell phone link capability, and rear DVD entertainment were options. Adaptive cruise control was available for the Supercharged edition.