🔧 Forester - Front Lower Control Arm Replacement

This repair replaces the front lower control arms on your Forester. The lower control arm connects the front wheel suspension to the vehicle body and holds the ball joint and bushings that keep the wheel positioned correctly.

Difficulty Level: Intermediate | Estimated Time: 3-5 hours for both front sides

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⚠️ Safety & Precautions

• ⚠️ Never work under your Forester with only a jack holding it up. Always use jack stands.
• ⚠️ The control arm supports suspension load. Keep the steering knuckle supported when the ball joint is disconnected.
• ⚠️ Do not hammer directly on the ball joint stud threads.
• ⚠️ Final tightening of the control arm bushing bolts must be done at normal ride height to avoid twisting the new bushings.
• ⚠️ A wheel alignment is required after control arm replacement.
• ⚠️ Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• 19mm lug nut socket
• Breaker bar 1/2-inch drive
• Ratchet 1/2-inch drive
• Ratchet 3/8-inch drive
• 12mm socket
• 14mm socket
• 17mm socket
• 19mm socket
• 21mm socket
• 12mm wrench
• 14mm wrench
• 17mm wrench
• 19mm wrench
• 21mm wrench
• Torque wrench 10-150 ft-lbs
• Torque wrench 50-250 ft-lbs
• Ball joint separator (specialty)
• Pickle fork ball joint separator (specialty)
• Hammer 3-lb
• Pry bar 18-inch
• Flathead screwdriver
• Needle-nose pliers
• Paint marker
• Penetrating oil
• Anti-seize brush
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front lower control arm assembly - Left: 1, Right: 1
• Front ball joint pinch bolt and nut - Qty: 2
• Front control arm mounting bolts and nuts - Qty: 4 bolts, 4 nuts
• Front stabilizer link nuts - Qty: 2
• Anti-seize compound - Qty: 1

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📋 Before You Begin

• Park your Forester on a flat, solid surface.
• Set the parking brake and place wheel chocks behind the rear wheels.
• Loosen the front wheel lug nuts before lifting the vehicle.
• Spray penetrating oil on the control arm mounting bolts, ball joint pinch bolt, and stabilizer link nut.
• Plan for a professional alignment immediately after the repair.
• No infotainment menu, scan tool command, EPB service mode, battery registration, or ADAS calibration is required.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen the Front Lug Nuts

• Use a 19mm lug nut socket and breaker bar 1/2-inch drive to loosen each front lug nut about half a turn.
• Keep the wheels on the ground while loosening them.
• Loose first, lift second.

Step 2: Raise and Support the Forester

• Use a floor jack at the front center jacking point to lift the front of your Forester.
• Place jack stands under the front side support points.
• Lower the vehicle carefully onto the jack stands.
• Gently shake the vehicle by hand to confirm it is stable before working underneath.

Step 3: Remove the Front Wheels

• Use the 19mm lug nut socket and ratchet 1/2-inch drive to remove the lug nuts.
• Remove both front wheels.
• Slide one wheel under the side of the vehicle as an extra safety backup.

Step 4: Mark the Control Arm Position

• Use a paint marker to mark the current position of the control arm bolts and brackets.
• These marks help you place the new arm close to the original position before alignment.

Step 5: Remove the Front Splash Shield if Needed

• Use a 12mm socket, 14mm socket, or flathead screwdriver to remove any splash shield fasteners blocking access to the control arm bolts.
• Set the clips and bolts aside in a small tray.

Step 6: Disconnect the Stabilizer Link from the Control Arm

• Use a 17mm socket and 17mm wrench to remove the stabilizer link nut from the lower control arm.
• The stabilizer link is the short rod that connects the sway bar to the suspension to reduce body lean in turns.
• If the stud spins, hold the stud with the correct wrench while turning the nut with the 17mm wrench.
• Move the stabilizer link aside.

Step 7: Support the Steering Knuckle

• Use the floor jack under the steering knuckle or lower hub area with light pressure only.
• The steering knuckle is the large metal part that holds the wheel hub and connects the suspension to the steering.
• Do not lift the vehicle off the jack stands.

Step 8: Remove the Ball Joint Pinch Bolt

• Use a 14mm socket and 14mm wrench to remove the ball joint pinch bolt and nut from the bottom of the steering knuckle.
• A pinch bolt clamps the ball joint stud tightly inside the steering knuckle.
• If rusty, spray more penetrating oil and let it soak for several minutes.
• Use a hammer 3-lb lightly on the bolt end only if needed, but do not damage the threads.

Step 9: Separate the Ball Joint from the Steering Knuckle

• Use a ball joint separator (specialty) to separate the ball joint stud from the steering knuckle.
• If the old control arm is being replaced and the ball joint boot will not be reused, a pickle fork ball joint separator (specialty) can be used.
• A pickle fork is a wedge-shaped tool that separates stuck suspension joints but often damages the rubber boot.
• Use the pry bar 18-inch gently to help lower the control arm while keeping the knuckle supported.

Step 10: Remove the Rear Control Arm Mounting Bolt

• Use a 19mm socket, 19mm wrench, and breaker bar 1/2-inch drive to loosen the rear control arm mounting bolt and nut.
• Remove the bolt only after the control arm is supported by hand or with the floor jack.

Step 11: Remove the Front Control Arm Mounting Bolt

• Use a 21mm socket, 21mm wrench, and breaker bar 1/2-inch drive to loosen the front control arm mounting bolt and nut.
• Remove the bolt and guide the control arm out by hand.
• Use a pry bar 18-inch carefully if the bushing sleeve is stuck in the bracket.

Step 12: Compare the Old and New Control Arms

• Place the old and new control arms side by side.
• Confirm the bushing positions, ball joint location, and stabilizer link mounting point match.
• Use an anti-seize brush to apply a thin coat of anti-seize compound to the shanks of the mounting bolts, not the threads.

Step 13: Install the New Control Arm

• Position the new control arm in the body brackets by hand.
• Install the front and rear mounting bolts by hand first.
• Use a 19mm socket, 21mm socket, and matching wrenches to snug the bolts only.
• Do not fully torque the bushing bolts yet.
• Snug now, torque at ride height.

Step 14: Reconnect the Ball Joint to the Steering Knuckle

• Use the floor jack and pry bar 18-inch as needed to align the ball joint stud with the steering knuckle.
• Insert the ball joint stud fully into the knuckle.
• Install a new ball joint pinch bolt and nut by hand.
• Use a 14mm socket, 14mm wrench, and torque wrench 10-150 ft-lbs to tighten the ball joint pinch bolt to Torque to 49 Nm (36 ft-lbs).

Step 15: Reconnect the Stabilizer Link

• Insert the stabilizer link stud into the control arm.
• Install the nut by hand.
• Use a 17mm socket, 17mm wrench, and torque wrench 10-150 ft-lbs to tighten the stabilizer link nut to Torque to 45 Nm (33 ft-lbs).

Step 16: Repeat on the Other Side

• Use the same tools and steps to replace the opposite front lower control arm.
• Replace control arms in pairs if the bushings or ball joints are worn on both sides.

Step 17: Reinstall the Wheels

• Place each wheel back on the hub.
• Start all lug nuts by hand to prevent cross-threading.
• Use a 19mm lug nut socket and ratchet 1/2-inch drive to snug the lug nuts in a star pattern.

Step 18: Set the Suspension at Normal Ride Height

• Use the floor jack to support under the outer end of one control arm.
• Raise the control arm until the vehicle just begins to lift slightly from the jack stand.
• This simulates normal ride height while the vehicle is still safely supported.
• Do not crawl under an unsupported vehicle.

Step 19: Final-Torque the Control Arm Mounting Bolts

• Use a 19mm socket, 21mm socket, matching wrenches, and torque wrench 50-250 ft-lbs.
• Tighten the front control arm mounting bolt to Torque to 130 Nm (96 ft-lbs).
• Tighten the rear control arm mounting bolt to Torque to 155 Nm (114 ft-lbs).
• Repeat ride-height loading and final torque on the other side.

Step 20: Lower the Forester and Torque the Lug Nuts

• Use the floor jack to raise the vehicle slightly and remove the jack stands.
• Lower your Forester fully to the ground.
• Use a 19mm lug nut socket and torque wrench 10-150 ft-lbs to tighten the lug nuts in a star pattern to Torque to 120 Nm (89 ft-lbs).

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✅ After Repair

• ✅ Turn the steering wheel fully left and right while parked. Listen for rubbing, clunks, or binding.
• ✅ Test drive slowly at first. Avoid highway speeds until the vehicle feels stable.
• ✅ Get a professional wheel alignment as soon as possible.
• ✅ Recheck all visible fasteners after the first short drive.
• ✅ Recheck lug nut torque after 25-50 miles of driving.

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💰 DIY vs Shop Cost

Shop Cost: $750-$1,300 parts + labor for both front lower control arms

DIY Cost: $250-$650 parts only

You Save: $500-$650 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-5 hours.

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🎯 Ready to get started?

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