AUDI 4K0839105S Tron Front Left Door Lock Actuator 643.AU1U21 4K0839015S
fits model: A6, A7, S6, S7, Q8. make: Audi. year: 1925–2021.
( Manufacturer Part Number: 4K0839105S ), ( Model: A6-AUDI ), ( Conditions Options: Lh Rear Lock Actuator ), ( Genuine Oem: Yes ), ( Ipn: 643.au1u21 ), ( Country Of Origin: Czechia ), ( Vintage Part: No ), ( Material: Aluminum, Plastic ), ( Finish: Matte ), ( Color: Black ), ( Placement On Vehicle: Front, Left ), ( Features: Durable, Easy Installation, No Drilling Required ), ( Type: Door Lock )
Review AUDI E tron Front Left Door Lock Actuator Oem fits A6 A7 S6 S7 Q8 1925–2021
The **Audi 4K0839105S (2019 2025) Front Left Door Lock Actuator (4K0839015S)** is a precision-engineered component designed exclusively for Audi s high-performance and luxury vehicle lineup, including the **A6, A7, S6, S7, Q8, and e-tron** models. This actuator is a critical part of the vehicle s door locking mechanism, ensuring seamless, reliable, and secure operation while maintaining the signature Audi blend of sophistication and engineering excellence. Crafted from high-grade materials, it incorporates a robust electric motor paired with a durable gear system, allowing for smooth and silent actuation even under the most demanding conditions. The actuator is engineered to withstand the rigors of daily driving, extreme temperatures, and prolonged use, making it a long-lasting solution for maintaining the integrity of your vehicle s door security system.
This part is fully compatible with Audi s advanced **Keyless Access and Push-Button Start** systems, ensuring seamless integration with the vehicle s central locking and immobilizer functions. The actuator s compact yet sturdy design allows for easy installation, fitting precisely within the door panel s structural framework without compromising aesthetics or functionality. Whether your vehicle requires a replacement due to wear and tear, a malfunctioning original component, or an upgrade for enhanced durability, this actuator delivers the precision and performance expected from Audi s premium engineering. Built to meet or exceed OEM specifications, it guarantees a perfect fit, reliable operation, and the same level of quality that Audi drivers have come to trust. Whether you re restoring a classic model or maintaining a cutting-edge electric vehicle like the **e-tron**, this actuator ensures that your door locking system remains efficient, secure, and free from unnecessary wear.
### **Pros and Cons of buying a Audi Door Lock Actuator (Part Numbers: 4K0839105S, 4K0839015S) for 2019 2025 Models (A6, A7, S6, S7, Q8, e-tron)**
#### **Pros:**1. **OEM Quality and Reliability**
- Audi s original equipment parts are engineered to meet strict manufacturer standards, ensuring durability and proper functionality. Unlike aftermarket alternatives, they are designed to integrate seamlessly with the vehicle s electrical and mechanical systems.
2. **Warranty Coverage**
- Purchasing directly from Audi or an authorized dealer often includes a warranty (typically 12 24 months), providing peace of mind against defects or premature failure. Some third-party sellers may offer limited warranties as well.
3. **Compatibility and Fitment**
- These actuators are specifically designed for the listed Audi models (2019 2025), reducing the risk of fitment issues that can occur with generic or non-OEM parts. They are built to match the exact specifications of the vehicle s door lock mechanism.
4. **Long-Term Performance**
- Audi s door lock actuators are built to last the lifespan of the vehicle if properly maintained. They are less likely to fail prematurely compared to cheaper, lower-quality replacements, which may wear out faster or cause intermittent issues.
5. **Ease of Installation**
- While installation can be complex (especially for those without mechanical/electrical experience), these parts are designed to work with Audi s standardized systems. High-quality wiring and mounting points reduce the risk of installation errors that could lead to further problems.
6. **Support for Advanced Features**
- Newer Audi models (including the e-tron) may have keyless entry, push-button start, or integrated sensors. OEM actuators are programmed to work with these advanced systems, ensuring all functions (e.g., remote unlocking, keyless access) operate correctly.
7. **Resale Value Protection**
- Using genuine Audi parts helps maintain the vehicle s value, especially if the door lock actuator is part of a larger service or repair. Dealers and buyers often prefer vehicles that have been serviced with OEM components.
---
#### **Cons:**1. **High Cost**
- OEM Audi parts are significantly more expensive than aftermarket alternatives. The price can range from **$200 $500 ** depending on the model and supplier, making them a costly repair compared to cheaper knockoffs.
2. **Longer Wait Times**
- Ordering directly from Audi or an authorized dealer may result in shipping delays, especially if the part is backordered. Third-party sellers (e.g., RockAuto, eBay, or specialty suppliers) can sometimes offer faster delivery but may carry risks (e.g., counterfeit parts).
3. **Complex Installation**
- Replacing a door lock actuator requires disassembling the door panel, wiring, and sometimes the window regulator. This job is best left to professionals unless you have experience with automotive electrical work. DIY mistakes can lead to short circuits, improper function, or voided warranties.
4. **Potential for Counterfeit Parts**
- Buying from untrusted sellers (e.g., unverified eBay listings or unknown online marketplaces) increases the risk of receiving fake or low-quality parts. Counterfeit actuators may fail quickly, cause electrical issues, or not fit properly.
5. **Additional Costs**
- Beyond the part itself, labor costs for professional installation can add **$150 $300 ** per door, depending on the shop s rates. If the door panel or wiring is damaged during removal, further repairs may be needed.
6. **Limited Availability for Older Models**
- While these parts cover a broad range (2019 2025), very early or late-year models might have slight variations. Always verify the exact part number matches your vehicle s year and trim before purchasing.
7. **Environmental and Ethical Concerns**
- Audi s manufacturing process involves resource-intensive production, and disposing of old parts may have environmental implications. Some buyers prefer aftermarket or recycled parts to mitigate this.
---
### **Conclusion:**Buying an **OEM Audi door lock actuator (4K0839105S/4K0839015S)** is the **best choice for long-term reliability, compatibility, and warranty protection**, especially if you prioritize the vehicle s performance and resale value. However, the **high cost and complexity of installation** make it a less ideal option for budget-conscious or DIY-focused buyers.
For those willing to compromise on cost, **high-quality aftermarket brands** (e.g., Dorman, ACDelco, or Bosch) can offer comparable performance at a fraction of the price, though they may lack warranty support. Always ensure the aftermarket part is **direct-fit** and comes with positive reviews.
If you re unsure about installation, **consult a professional mechanic** to assess whether the part is truly necessary (e.g., rule out wiring or sensor issues first) and weigh the cost of labor against the part s expense.
---
### **Recommendation:**- **If budget is not a concern and you want the best long-term solution:** Purchase the **OEM part from an authorized Audi dealer or trusted supplier** (e.g., AudiParts.com, RockAuto with verified sellers). Have a mechanic install it to avoid voiding warranties or causing further damage.
- **If cost is a priority and you re comfortable with aftermarket parts:** Choose a **direct-fit, high-quality aftermarket actuator** (e.g., Dorman 80409200 or Bosch 1 987 434 001) from a reputable seller like **RockAuto, Amazon, or eBay (with seller feedback)**. Ensure the part matches your exact model year.
- **If installation is daunting:** Get a **mechanic to diagnose the issue first** sometimes door lock problems stem from wiring, sensors, or the door latch itself, not just the actuator.
**Final Note:** Always verify the part number with your vehicle s exact specifications (year, trim, and any software updates) before purchasing to avoid mismatches.
Details:
Standard Warranty. LH REAR LOCK ACTUATOR 4K0839105S.
part #: 4k0839105s prices
- $65.00-$109.01
specifications carlockiio:
- for models: A6, A7, S6, S7, Q8
- for makes: Audi
- for years: 1925-2021
- mpn: 4k0839105s
- model: A6-audi
- conditions options: Lh Rear Lock Actuator
- genuine oem: Yes
- ipn: 643.au1u21
- country of origin: Czechia
- vintage part: No
- material: Aluminum, Plastic
- finish: Matte
- color: Black
- placement on vehicle: Front, Left
- features: Durable, Easy Installation, No Drilling Required
- type: Door Lock
payments carlockiio:
- credit card: Diners-club
- wallet: Apple-pay
- other
returns carlockiio:
- policy: Returns Accepted
- paid by: Buyer
- time: 30 Days
offer carlockiio:
- options: Ship-to-home
- started: March 12, 2026
- sold: 0
- availability: In Stock
- best offers: True
- quantity: 1
seller carlockiio:
- rating: 100.0%
- city: Rancho Cordova, California
- # reviews: 3939
general carlockiio:
- condition: Used
- Car Truck Parts Accessories > Exterior Parts Accessories > Exterior Locks Lock Hardware
shipping carlockiio:
- service: Standard
- type: Fixed
- transit: 4-7 Days
- class: Standard
- cost: $0.00
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