🔧 Forester - Front Lower Control Arm Replacement

This repair replaces the front lower control arms on your Forester. The control arm holds the wheel in the correct position and contains bushings plus a ball joint that can wear out and cause clunks, wandering, uneven tire wear, or loose steering.

Difficulty Level: Advanced | Estimated Time: 3-5 hours

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⚠️ Safety & Precautions

• ⚠️ Support your Forester with jack stands only; never work under a vehicle held up by a jack.
• ⚠️ The front suspension is load-bearing. Keep hands clear when loosening control arm bolts.
• ⚠️ Do not hammer directly on the steering knuckle or ball joint stud; damage can cause unsafe steering looseness.
• ⚠️ Final tightening of control arm bushing bolts must be done at normal ride height to avoid twisting and quickly ruining the bushings.
• ⚠️ A wheel alignment is required after replacing control arms.
• ⚠️ 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 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Mechanic gloves
• 1/2-inch drive breaker bar
• 1/2-inch drive ratchet
• 3/8-inch drive ratchet
• Torque wrench (10-200 Nm range)
• 19mm socket
• 17mm socket
• 14mm socket
• 12mm socket
• 19mm wrench
• 17mm wrench
• 14mm wrench
• 12mm wrench
• Flathead screwdriver
• Trim clip removal tool
• Needle-nose pliers
• Ball joint separator (specialty)
• Dead blow hammer
• Pry bar
• Paint marker
• Penetrating oil
• Wire brush

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front lower control arm assembly, left - Qty: 1
• Front lower control arm assembly, right - Qty: 1
• Front lower ball joint pinch bolt and nut - Qty: 2
• Front stabilizer link nuts - Qty: 2
• Front control arm mounting bolts and nuts - Qty: 1 kit
• Wheel alignment service - Qty: 1

Replace in pairs: For best handling and even bushing wear, replace both front lower control arms together.

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📋 Before You Begin

• 🚗 Park your Forester on level ground and set the parking brake.
• 🧱 Place wheel chocks behind the rear wheels.
• 🛞 Loosen the front wheel lug nuts slightly before lifting the vehicle.
• 🧰 Spray penetrating oil on the control arm bolts, ball joint pinch bolt, and stabilizer link nut before starting.
• 📌 A ball joint separator is a tool that separates the ball joint from the steering knuckle without damaging the rubber boot or metal parts.
• 📌 A torque wrench tightens bolts to a measured force so suspension parts stay secure without being over-tightened.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen the Front Wheel Lug Nuts

• Use a 19mm socket and 1/2-inch drive breaker bar to loosen each front wheel lug nut about one turn.
• Do not remove the lug nuts yet.
• Loosen wheels before lifting.

Step 2: Lift and Support the Front of the Vehicle

• Use a floor jack at the front center jacking point to raise your Forester.
• Place jack stands under the front side pinch weld support points.
• Lower the vehicle gently onto the jack stands.
• Shake the vehicle lightly by hand to make sure it is stable before working underneath.

Step 3: Remove the Front Wheels

• Use a 19mm socket and 1/2-inch drive ratchet to remove the loosened lug nuts.
• Remove both front wheels and set them flat on the ground.

Step 4: Remove the Lower Splash Shield if It Blocks Access

• Use a 12mm socket or trim clip removal tool to remove the lower splash shield fasteners that block access to the rear control arm bolts.
• Use a flathead screwdriver to gently lift plastic clips if needed.
• Set the splash shield and clips aside in order.

Step 5: Mark the Original Control Arm Position

• Use a paint marker to mark around the rear control arm bushing bracket and bolt positions.
• This helps you install the new arm close to the old position before the alignment.
• Marks help, but alignment is still required.

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 control arm.
• If the link stud spins, hold the stud with the correct wrench while turning the nut with the 17mm wrench.
• Move the stabilizer link out of the control arm.

Step 7: 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.
• Use a wire brush and penetrating oil if the pinch bolt area is rusty.
• Discard the old pinch bolt and nut if replacing with new hardware.

Step 8: Separate the Ball Joint from the Steering Knuckle

• Use a ball joint separator to separate the lower ball joint from the steering knuckle.
• Use a dead blow hammer only on the separator tool if extra force is needed.
• Do not strike the threaded ball joint stud directly.
• Use a pry bar gently under the control arm if the ball joint is stuck.

Step 9: Remove the Front Control Arm Mounting Bolt

• Use a 19mm socket and 19mm wrench to remove the front control arm mounting bolt and nut.
• Support the control arm by hand as the bolt comes out.

Step 10: Remove the Rear Control Arm Mounting Bolt

• Use a 19mm socket and 19mm wrench to remove the rear control arm mounting bolt and nut.
• Use a pry bar gently to help slide the control arm out of the subframe brackets.
• Remove the control arm from the vehicle.

Step 11: Compare the Old and New Control Arms

• Place the old and new control arms side by side on the ground.
• Confirm the ball joint, bushings, stabilizer link mount, and mounting points match.
• Use a wire brush to clean the subframe mounting pockets before installation.

Step 12: Install the New Control Arm into the Subframe

• Position the new control arm into the subframe brackets by hand.
• Install the rear mounting bolt and nut loosely by hand.
• Install the front mounting bolt and nut loosely by hand.
• Do not final-tighten these bolts yet.
• Loose bolts help parts line up.

Step 13: Seat the Ball Joint into the Steering Knuckle

• Guide the ball joint stud fully into the steering knuckle by hand.
• Use a floor jack under the control arm only if slight upward pressure is needed.
• Install the new ball joint pinch bolt and nut using a 14mm socket and 14mm wrench.
• Torque to 50 Nm (37 ft-lbs).

Step 14: Reconnect the Stabilizer Link

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

Step 15: Repeat on the Opposite Side

• Use the same tools and steps to replace the control arm on the other side.
• Keep each side’s hardware organized so bolts go back into the correct positions.

Step 16: Set the Suspension to Normal Ride Height

• Use a floor jack under the outer end of the control arm to raise the suspension until it sits close to normal ride height.
• Normal ride height means the control arm is sitting like it would with the vehicle on the ground.
• Do this before tightening the front and rear bushing bolts.

Step 17: Final-Tighten the Control Arm Mounting Bolts

• Use a 19mm socket, 19mm wrench, and torque wrench to tighten the front control arm mounting bolt.
• Torque to 95 Nm (70 ft-lbs).
• Use a 19mm socket, 19mm wrench, and torque wrench to tighten the rear control arm mounting bolt.
• Torque to 125 Nm (92 ft-lbs).

Step 18: Reinstall the Lower Splash Shield

• Position the splash shield back in place.
• Use a 12mm socket, trim clip removal tool, or flathead screwdriver to reinstall the original fasteners and clips.

Step 19: Reinstall the Front Wheels

• Lift each wheel into place by hand.
• Thread the lug nuts by hand first to avoid cross-threading.
• Use a 19mm socket and 1/2-inch drive ratchet to snug the lug nuts in a star pattern.

Step 20: Lower the Vehicle 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 socket and torque wrench to tighten the wheel lug nuts in a star pattern.
• Torque to 120 Nm (89 ft-lbs).

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✅ After Repair

• ✅ Turn the steering wheel lock-to-lock while parked and listen for binding, popping, or rubbing.
• ✅ Test drive slowly first. Listen for clunks and make sure the steering wheel returns smoothly.
• ✅ Get a professional 4-wheel alignment as soon as possible after the repair.
• ✅ Recheck all visible mounting points after the first short drive.
• ✅ Recheck wheel lug nut torque after 25-50 miles.

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💰 DIY vs Shop Cost

Shop Cost: $750-$1,300 (parts + labor)

DIY Cost: $280-$650 (parts only)

You Save: $470-$650 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2.5-4.0 hours.

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🎯 Ready to get started?

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