4M0407182A 4M0407182 Control Arm Bushing: Diagnosis and OE Fitment Guide

QUICK ANSWER

Suspected control-arm bushing wear, movement or suspension noise should be confirmed through physical inspection and the workshop checks appropriate to this component before a replacement part is ordered. The same symptom can have more than one cause, so compare the installed component, all OE references, connections and vehicle information.

WHAT THIS PART DOES

The Control Arm Bushing allows controlled suspension movement while locating the control arm and isolating vibration. Its role does not prove that it is the cause of a customer complaint; diagnosis must connect the observed fault to this component.

SYMPTOM SNAPSHOT

• Cracked, separated or distorted bushing rubber
• Excess control-arm movement confirmed during inspection
• Knock or clunk over road inputs with the source traced to the bushing
• Steering or braking instability associated with confirmed bushing movement

These symptoms are diagnostic clues, not a guarantee that this part has failed.

DIAGNOSIS BEFORE ORDERING

1. Inspect the bushing at normal ride position and under controlled load
2. Check for rubber separation, sleeve movement and contact marks
3. Inspect ball joints, anti-roll-bar links, mounts and fasteners before assigning the noise
4. Confirm axle position, bushing orientation, dimensions and OE reference before ordering

OEM REFERENCE

• 4M0407182A
• 4M0407182

Every verified OE reference from the product record is retained. Revision letters and alternate numbers must not be discarded during comparison.

OE-SPECIFIC BUYING CHECK

• Audi catalog references identify 4M0407182A as the front lower control-arm inner bushing for left or right-side use.
• Audi catalog history lists 4M0407182 as the superseded reference for 4M0407182A.
• Catalog service information states the removed bushing is not reusable; confirm arm position, press orientation, dimensions and VIN before ordering or installation.
• Catalog references identify 4M0407182 as the earlier front lower inner control-arm-bushing reference associated with 4M0407182A.

VEHICLE APPLICATION REFERENCES

• AUDI A6
• AUDI A8
• AUDI Q5

Model names are reference points only. Production date, engine, market specification and connector changes can affect compatibility.

WHEN REPLACEMENT IS JUSTIFIED

Replacement is reasonable when inspection or workshop testing confirms damage or a functional failure that matches the role of this component. If the evidence conflicts with the product function, continue diagnosis instead of replacing the part.

RELATED PARTS TO INSPECT

• Control-arm ball joint and mounting fasteners
• Stabilizer links and bushings
• Wheel alignment and tire condition after suspension repair

VIN CHECK

Confirm fitment using OE number and VIN before ordering.

For fitment questions, share the OEM part number, VIN number, or vehicle information with our team before ordering.

CHECK THE PART AND OE DETAILS

Review 4M0407182A / 4M0407182 product images and fitment details.

WORKSHOP AND BULK ORDERS

Repair shops and distributors can send an OE list, quantities and vehicle information for fitment review and bulk-order support.