AUDI 4E0407509E Front Left Upper Rearward Control Arm 4E0407509B

( Manufacturer Part Number: 4E0407509E ), ( Part Type: Control Arm ), ( Manufacturer Warranty: 30 Day ), ( Ipn: 4e0407509b ), ( Tested: Tested, Cleaned And Inspected ), ( Placement On Vehicle: Front, Left ), ( Fitment Type: Direct Replacement )

Review AUDI Front Left Upper Rearward Control Arm fits QUATTRO A8 2004–2010

The **Audi 4E0 407 509E Front Left Upper Rearward Control Arm (2004 2010 A8 Quattro)** is a precision-engineered suspension component designed to deliver exceptional handling, stability, and ride comfort in one of Audi s most luxurious and performance-oriented models. This high-quality upper rearward control arm, part of the A8 s sophisticated multi-link rear suspension system, plays a critical role in maintaining optimal wheel alignment, damping road irregularities, and ensuring smooth power delivery especially during dynamic driving maneuvers. Crafted from durable, high-strength steel, the arm is engineered to withstand the demands of both daily commuting and spirited driving, offering superior durability and resistance to fatigue over the long term. Its robust construction, featuring precision-machined bushings and carefully balanced geometry, allows for minimal flex and maximum responsiveness, which is essential for the A8 s reputation for refined performance and precise steering feedback. Whether navigating tight corners at high speeds or absorbing the subtle undulations of a winding mountain road, this control arm ensures that the rear axle remains stable, reducing body roll and enhancing overall vehicle control. For enthusiasts seeking to restore or upgrade their A8 s suspension, this genuine Audi part is an ideal choice, offering the same level of engineering excellence that Audi has come to expect combining reliability with the brand s signature blend of luxury and performance.

### **Pros and Cons of Buying a 2004 2010 Audi A8 (4E0407509E) Front Left Upper Rearward Control Arm**

1. **Reliability and Durability** Audi s suspension components, including control arms, are generally well-built and designed for longevity, especially in the A8 s premium segment. The upper rearward control arm (part number **4E0407509E**) is a critical part of the rear suspension, and a genuine or high-quality aftermarket replacement can restore proper alignment and handling.

2. **Improved Handling and Stability** A worn or damaged upper rearward control arm can cause excessive rear-end movement, leading to poor handling, uneven tire wear, and potential alignment issues. Replacing it ensures smoother ride quality, better steering response, and reduced vibration.

3. **Prevents Further Damage** Ignoring a failing control arm can lead to accelerated wear on other suspension components, such as bushings, ball joints, or even the rear subframe. Addressing it early prevents costly repairs down the line.

4. **Compatibility with Aftermarket Upgrades** If you plan to modify your A8 (e.g., lowering springs, stiffer bushings, or performance suspension), a fresh control arm ensures compatibility and proper fitment.

5. **Easier Maintenance** The A8 s suspension is relatively straightforward to service, and the upper rearward control arm is accessible without major disassembly, making DIY replacement feasible for those with mechanical experience.

6. **Potential for Long-Term Use** If the rest of the suspension is in good condition, a new control arm can extend the life of the vehicle, especially if it s used for daily driving or long-distance travel.

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1. **Cost of Replacement** Genuine Audi parts (OEM) can be expensive, often ranging between **$200 $400** for the part alone, depending on the supplier. Aftermarket alternatives (e.g., Febi Bilstein, Meyle, or Mann) may be cheaper but vary in quality. Labor costs for installation (if not DIY) can add **$150 $300** depending on the shop.

2. **Potential for Counterfeit or Low-Quality Parts** Some aftermarket parts may not meet Audi s exact specifications, leading to premature wear or improper fit. Always source from reputable suppliers and verify part authenticity.

3. **DIY Difficulty** While the A8 s suspension is accessible, replacing the upper rearward control arm requires removing the rear wheel, disconnecting the driveshaft (if equipped with Quattro), and possibly adjusting the rear subframe. Those without mechanical experience may find it challenging.

4. **Bushing Wear** Even with a new control arm, the **bushings** (rubber or polyurethane inserts) may still wear out over time. If the original bushings are degraded, they should be replaced simultaneously for optimal performance.

5. **Alignment Required Post-Installation** After replacing the control arm, a **wheel alignment** is essential to ensure proper tire contact and prevent uneven wear. This adds **$80 $150** to the total cost.

6. **Rust Concerns (if applicable)** Older A8s (especially those driven in snowy or salted regions) may have rusted suspension components. Inspect the control arm, mounting points, and surrounding areas for corrosion before purchasing a used part.

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Replacing the **2004 2010 Audi A8 (4E0407509E) front left upper rearward control arm** is a **necessary and beneficial** repair if the part is failing, as it directly impacts handling, safety, and long-term suspension health. The pros such as improved ride quality, prevention of further damage, and compatibility with upgrades outweigh the cons, provided you source a **high-quality part** and either install it correctly or have a professional do so.

The main drawbacks are the **upfront cost** and the **potential complexity of DIY installation**, but these are outweighed by the **long-term savings and performance benefits**. If the rest of the suspension is in good shape, this repair is a **worthwhile investment** for maintaining the A8 s premium driving experience.

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1. **Verify the Issue** Confirm that the upper rearward control arm is indeed the problem (check for excessive play, cracks, or misalignment). A **suspension inspection** by a mechanic can rule out other issues (e.g., worn bushings, damaged subframe).

- **Genuine Audi (OEM)** Most reliable but expensive.

- **High-Quality Aftermarket (Febi Bilstein, Meyle, Mann)** Good balance of cost and performance.

- Avoid **no-name brands** unless they have strong reviews.

3. **DIY or Professional Installation?**

- If you have **mechanical experience**, DIY installation is cost-effective.

- If unsure, **hire a reputable shop** to ensure proper alignment and torque specifications.

4. **Replace Bushings Simultaneously** If the original bushings are worn, replace them to avoid future issues.

5. **Get an Alignment** Always perform a **4-wheel alignment** after replacement to maximize tire life and handling.

6. **Budget Accordingly** Expect to spend **$300 $600 total** (part labor if applicable), but this is a **preventative measure** that can save money on bigger suspension failures later.

**Final Verdict:** **Proceed with replacement** if the part is confirmed faulty, as it is a **critical suspension component** that affects safety and driving dynamics. Prioritize **quality parts and proper installation** to ensure long-term reliability.

Details:

Part Fitment and Compatibility. Remember LEFT means the Drivers side of vehicle and RIGHT Passengers in our listings. 2004 AudiA8 QuattroSedan4.2LGas, 2005 2010AudiA8 6.0LGas, 2004 -.2LGas, 6.0LGas.

part #: 4e0407509e prices

• $103.88-$293.69

specifications swabasus:

• for models: A8, Quattro
• for makes: Audi
• for years: 2004-2010
• mpn: 4e0407509e
• part type: Control Arm
• manufacturer warranty: 30 Day
• ipn: 4e0407509b
• tested: Tested, Cleaned And Inspected
• placement on vehicle: Front, Left
• fitment type: Direct Replacement

payments swabasus:

• other
• wallet: Paypal
• credit card: Diners-club

general swabasus:

• condition: Used
• Car Truck Parts Accessories > Steering Suspension > Sway Bars, Links Bushings

returns swabasus:

• time: 30 Days
• paid by: Buyer
• policy: Returns Accepted

offer swabasus:

• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: May 18, 2026
• sold: 0

seller swabasus:

• # reviews: 102318
• city: Waverly, Minnesota
• rating: 99.8%

shipping swabasus:

• type: Fixed
• service: USPS Ground Advantage, USPS Priority Mail, FedEx 2Day One Rate Extra Large Box, FedEx Standard Overnight
• cost: $0.00
• transit: 2-4 Days
• carrier: USPS, FedEx
• class: Standard, Expedited, One-day

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