🔧 Sienna - Front Lower Control Arm Replacement

The front lower control arms locate the front wheels and contain bushings and a ball joint that wear out and cause clunks, wandering, and uneven tire wear. Replacing the control arms restores proper suspension movement, but you’ll need a wheel alignment afterward.

Difficulty Level: Advanced | Estimated Time: 2.5-5.0 hours (both sides)

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⚠️ Safety & Precautions

• ⚠️ Support your Sienna on jack stands before working underneath.
• ⚠️ Keep hands clear when separating the ball joint; parts can release suddenly.
• ⚠️ Do not let the steering knuckle hang by the brake hose or ABS wire.
• ⚠️ Final-tighten the control arm bushing bolts at ride height to prevent bushing damage and noise.

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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
• 21mm socket
• 1/2" drive breaker bar
• 1/2" drive torque wrench (20–250 ft-lbs range)
• 14mm socket
• 17mm socket
• 19mm socket
• 22mm socket
• Ratchet (3/8" drive)
• Socket extension set
• Combination wrench set (14mm–22mm)
• Pry bar
• Ball joint separator (specialty)
• Hammer (2–3 lb)
• Penetrating oil
• Paint marker

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front lower control arm (left) - Qty: 1
• Front lower control arm (right) - Qty: 1
• Front lower ball joint nut - Qty: 2
• Front lower ball joint cotter pin - Qty: 2

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📋 Before You Begin

• Park on level ground, set the parking brake, and chock the rear wheels.
• Break loose the front lug nuts using a 21mm socket and breaker bar before lifting.
• Spray penetrating oil on the control arm bolts and ball joint nut to save time.
• Plan an alignment right after this job.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and secure the front end

• Use a floor jack to lift the front of your Sienna at the front center jacking point.
• Set it down on jack stands placed at the approved support points.
• Remove the front wheels using a 21mm socket and ratchet.

Step 2: Remove any splash shield blocking access

• If the lower splash shield is in the way, remove its bolts/clips using a 10mm socket or trim clip tool (use what your fasteners require).

Step 3: Disconnect the stabilizer (sway bar) link from the control arm

• Remove the sway bar end link nut at the control arm using a 17mm socket and combination wrench.
• If the stud spins, hold the flats with an appropriate combination wrench while loosening the nut.

Step 4: Separate the lower ball joint from the steering knuckle

• Remove the cotter pin using needle-nose pliers.
• Remove the ball joint nut using a 19mm socket (some setups use a different size; use the socket that fits snug).
• Install a ball joint separator (specialty) (a tool that pops the tapered joint apart) and separate the ball joint from the knuckle.
• Support the knuckle so it doesn’t pull on the brake hose or ABS wire.
• Torque spec (ball joint nut): Torque to 127 Nm (94 ft-lbs), then continue to align for cotter pin.

Step 5: Unbolt the control arm from the subframe

• Mark the position of any alignment cam washers/bolts (if equipped) using a paint marker so you can reinstall close to the original alignment.
• Remove the front and rear control arm bushing bolts/nuts using a 19mm socket and breaker bar (use a combination wrench on the nut side if needed).
• Work the control arm out of the subframe using a pry bar if it’s stuck.

Step 6: Install the new control arm (leave bushing bolts snug, not final-torqued)

• Position the new control arm into the subframe and start the bushing bolts by hand using a ratchet and correct socket.
• Reconnect the ball joint stud into the knuckle by hand, then install the new nut using a ratchet and correct socket.
• Reconnect the sway bar end link to the control arm using a ratchet and correct socket.
• Hand-start every bolt to avoid cross-threading.

Step 7: Tighten at ride height (critical)

• Raise the outer end of the control arm with a floor jack until the suspension sits close to normal ride height.
• Now torque the bushing bolts using a torque wrench.
• Torque spec (control arm bushing bolts): Torque to 200 Nm (148 ft-lbs).
• Torque the sway bar end link nut using a torque wrench.
• Torque spec (stabilizer link nut): Torque to 74 Nm (55 ft-lbs).
• Torque the ball joint nut using a torque wrench.
• Torque spec (ball joint nut): Torque to 127 Nm (94 ft-lbs), then continue to align for cotter pin.
• Install a new cotter pin using needle-nose pliers.

Step 8: Reinstall shields and wheels

• Reinstall the splash shield using the same socket you removed it with.
• Reinstall wheels and snug lug nuts using a 21mm socket.
• Lower your Sienna and torque lug nuts with a torque wrench.
• Torque spec (lug nuts): Torque to 103 Nm (76 ft-lbs).

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✅ After Repair

• Test drive slowly first and listen for clunks over small bumps.
• Recheck lug nut torque using a torque wrench after 25–50 miles.
• Get a professional 4-wheel alignment as soon as possible (control arm removal affects camber/caster/toe).
• If the steering wheel is off-center after the repair, do not ignore it—get the alignment corrected.

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💰 DIY vs Shop Cost

Shop Cost: $900-$1,800 (parts + labor)

DIY Cost: $250-$650 (parts only)

You Save: $650-$1,150 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?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.