This procedure covers the replacement of the front lower control arm (radius arm) on a 2014-2019 Toyota Corolla with the 1.8L I4 engine.

Warnings

Tools required

Parts

• Front lower control arm (radius arm) × 1 — Use OEM specification
• Ball joint castle nut × 1 — Often included with control arm
• Control arm mounting bolts × 2 — Inspect and replace if corroded

Preparation

1. Park vehicle on level surface and engage parking brake
2. Place wheel chocks behind rear wheels
3. Loosen front wheel lug nuts while vehicle is on ground
4. Raise front of vehicle with floor jack at designated lift point
5. Support vehicle securely on jack stands under frame rails
6. Remove front wheel completely
7. Spray control arm bolts and ball joint nut with penetrating oil if corroded

Procedure

1. 1

   Remove sway bar end link (if necessary)
   If the sway bar end link interferes with access to the control arm, disconnect it from the lower control arm. Hold the ball stud with a 6mm Allen key while removing the nut with a 14mm socket. Note the orientation for reinstallation.
   Torque spec

   Sway Bar Link Nuts55 Nm (41 lb-ft)
2. 2

   Separate ball joint from steering knuckle
   Remove the castle nut securing the lower ball joint to the steering knuckle using a 19mm socket. Insert a ball joint separator tool between the control arm and knuckle. Apply pressure to separate the ball joint taper from the knuckle bore. The knuckle will drop slightly when separated.
   ⚠Do not strike the ball joint stud threads directly as this can damage the threads. Use a proper separator tool.
   Torque spec

   Ball Joint Nut84 Nm (62 lb-ft)
3. 3

   Remove front control arm mounting bolt
   Locate the front mounting bolt that secures the control arm to the front subframe. This bolt passes through the control arm bushing horizontally. Use a 17mm socket and breaker bar to remove this bolt completely. Support the control arm as the bolt is removed.
   Torque spec

   Control Arm Bolts165 Nm (122 lb-ft)
4. 4

   Remove rear control arm mounting bolt
   Locate the rear mounting bolt that secures the control arm to the rear subframe bracket. Use a 17mm socket and breaker bar to remove this bolt completely. The control arm will now be free to remove from the vehicle.
   Torque spec

   Control Arm Bolts165 Nm (122 lb-ft)
5. 5

   Remove control arm from vehicle
   Maneuver the control arm downward and outward from the subframe and steering knuckle. It may require some rotation to clear the subframe and brake components. Inspect the mounting bolt holes in the subframe for damage or elongation.
   ℹ️Check the condition of the bushings on the removed control arm. Cracking, tearing, or separation indicates the arm needed replacement.
6. 6

   Prepare new control arm
   Unbox the new control arm and verify it matches the old part exactly. Ensure the ball joint boot is intact and the bushings are properly seated. Clean the mounting bolt holes in the subframe with a wire brush to ensure proper bolt seating.
7. 7

   Install new control arm
   Position the new control arm into the subframe mounting points. Align the front and rear bushing holes with the subframe brackets. Insert both mounting bolts finger-tight but do not torque yet. The vehicle must be at ride height to torque these bolts.
   ⚠Do NOT torque control arm bolts at this time. They must be torqued with vehicle weight on suspension.
   Torque spec

   Control Arm Bolts165 Nm (122 lb-ft)
8. 8

   Connect ball joint to steering knuckle
   Lift the control arm and insert the ball joint stud into the steering knuckle hole. It may require pushing up on the control arm or prying down on the knuckle. Install the new castle nut and tighten to specification using a 19mm socket and torque wrench.
   Torque spec

   Ball Joint Nut84 Nm (62 lb-ft)
9. 9

   Reconnect sway bar end link (if removed)
   If the sway bar end link was removed in step 1, reconnect it to the lower control arm. Hold the ball stud with a 6mm Allen key and tighten the nut to specification with a 14mm socket and torque wrench.
   Torque spec

   Sway Bar Link Nuts55 Nm (41 lb-ft)
10. 10

    Reinstall wheel and lower vehicle
    Reinstall the wheel and thread lug nuts by hand. Tighten lug nuts in a star pattern until snug but do not torque yet. Remove jack stands and carefully lower the vehicle until the tires contact the ground with full vehicle weight on the suspension. Do not lower completely yet.
11. 11

    Torque control arm mounting bolts at ride height
    With the vehicle weight on the suspension and tires on the ground, torque both the front and rear control arm mounting bolts to specification using a 17mm socket and torque wrench. This ensures the bushings are not pre-loaded in the wrong position.
    ⚠This is the critical step for bushing longevity. Torquing with suspension hanging will cause premature bushing failure.
    Torque spec

    Control Arm Bolts165 Nm (122 lb-ft)
12. 12

    Final torque wheel lug nuts
    With the vehicle fully on the ground, torque all wheel lug nuts to specification in a star pattern using a 19mm socket and torque wrench.
    Torque spec

    Wheel Lug Nuts129 Nm (95 lb-ft)

Reassembly

1. Double-check that all fasteners are torqued to specification
2. Verify the ball joint castle nut is properly seated and secured
3. Confirm no tools or parts were left in the wheel well

Verification

• Test drive the vehicle at low speed and verify no clunking or unusual noises from the front suspension
• Check for proper steering response and straight-line tracking
• Perform a visual inspection under the vehicle to confirm all bolts are tight
• Schedule a professional wheel alignment as control arm replacement affects toe and camber settings

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