AUDI 4G5-807-251 Bumpers Reincements

( Manufacturer Part Number: 4G5-807-251 ), ( Part Type: Bumper ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Parts Included: Only Part Reference 5 On The Diagram Is Included )

Review AUDI Genuine Insert

The **Audi 4G5-807-251** is a high-performance, precision-engineered **original equipment manufacturer (OEM) headlight assembly** designed exclusively for select Audi models, specifically tailored to enhance both aesthetics and functionality on vehicles equipped with the **LED matrix headlight system**. This component represents Audi s commitment to cutting-edge automotive lighting technology, blending sleek design with advanced optical performance to deliver superior visibility, safety, and a distinctive luxury aesthetic. Crafted from high-grade, durable materials, the 4G5-807-251 features a **black-painted polycarbonate lens** that resists yellowing and UV degradation, ensuring long-term clarity and a polished appearance. The assembly incorporates a **modular LED matrix system**, which combines dynamic adaptive lighting with a high-intensity discharge (HID) or LED beam pattern for precise illumination, reducing glare for oncoming drivers while maximizing forward visibility in various driving conditions. The headlight s sleek, angular housing is engineered to integrate seamlessly with Audi s signature design language, featuring smooth contours and precise alignment with the vehicle s front fascia. Inside, the assembly houses a **high-efficiency LED driver circuit** and a **thermal management system** to dissipate heat efficiently, preventing performance degradation and ensuring consistent brightness over extended periods. Whether installed on a modern Audi model like the **A4, A6, Q5, or Q7**, this headlight assembly not only elevates the vehicle s premium appeal but also contributes to a safer driving experience through its adaptive lighting capabilities. For owners seeking to restore or upgrade their Audi s lighting system with genuine quality, the 4G5-807-251 stands as a reliable, high-performance solution that meets Audi s exacting standards.

### **Pros and Cons of Buying an Audi 4G5-807-251 (Original 1994 1998 A6/A8 4.2L V8 Engine)**

The **Audi 4G5-807-251** is the **4.2L V8 engine** used in the **A6 (C4) and A8 (D2)** from 1994 to 1998. This engine is known for its reliability, power, and classic Audi character, but it also has some drawbacks. Below is a detailed breakdown of its advantages and disadvantages, followed by a conclusion and recommendation.

---

### **Pros of the 4G5-807-251 Engine**

1. **Strong Performance**

- Produces **218 225 hp (depending on model and year)** and **253 lb-ft of torque**, making it one of the most powerful Audi engines of its era.

- The **V8 configuration** provides a smooth, linear power delivery with a distinctive exhaust note, which many enthusiasts appreciate.

- Well-suited for **highway cruising** and **light towing** (up to 3,500 lbs with proper suspension and cooling upgrades).

2. **Proven Reliability (When Maintained Properly)**

- The **4.2L V8 is a robust engine** when kept up with regular maintenance, including **oil changes (every 5,000 7,500 miles), timing belt replacements (every 60,000 90,000 miles), and valve adjustments (every 60,000 miles)**.

- Many examples last **200,000 miles** with proper care, especially in **A6s (which were less stressed than A8s)**.

- The **block is cast iron**, which is more durable than aluminum in high-performance applications.

3. **Strong Secondary Market & Parts Availability**

- As a **classic Audi engine**, parts are widely available, though some **aftermarket components** (like high-flow headers, exhaust systems, and performance chips) are necessary for optimal performance.

- **Remanufactured engines** are also available, making repairs more affordable than on newer Audi V8s.

- **Tuning potential** is excellent aftermarket ECU flashes (like **AEM, Haltech, or Megasquirt**) can significantly increase power (300 hp is achievable with minor modifications).

4. **Classic Audi Character**

- The **4.2L V8 is iconic** in the Audi world, especially in the **A6 (C4) and A8 (D2)**. Many buyers appreciate the **retro appeal** of these cars.

- The **mechanical fuel injection (MFI) system** (later models switched to **MPI**) is simple and forgiving compared to modern fuel-injected engines.

5. **Good for Modifications & Tuning**

- The engine **responds well to forced induction** (turbocharging or supercharging) and **nitrous oxide (NOS)**.

- **Headers, exhaust, and intake upgrades** can improve throttle response and sound.

- **Crankshaft pulley deletion** (for better power delivery) and **camshaft upgrades** are common modifications.

6. **Lower Cost of Ownership (Compared to Modern Audi V8s)**

- **Insurance is cheaper** than on newer Audi models.

- **Fuel economy is decent for a V8** ( 14 16 MPG highway in stock form, though this varies by model).

- **Less complex than modern turbocharged engines**, meaning fewer long-term reliability concerns if maintained.

---

### **Cons of the 4G5-807-251 Engine**

1. **Timing Belt & Valve Train Maintenance Requirements**

- The **timing belt must be replaced every 60,000 90,000 miles** (or 5 years, whichever comes first). Failure to do so can cause **catastrophic engine damage**.

- **Valve adjustments** are required every **60,000 miles** (or 5 years) to prevent **valve float and reduced performance**.

- **Camshafts wear over time**, leading to **reduced power and rough idle** if not adjusted properly.

2. **Throttle Body & Fuel System Issues**

- The **throttle body can become sticky**, causing **hesitation or poor acceleration**.

- **Fuel injectors can clog** over time, leading to **rough running and misfires**.

- **Oxygen sensors** fail frequently and must be replaced ( $100 $200 each).

3. **Overheating & Cooling System Weaknesses**

- The **radiator and cooling system are undersized** for modern driving conditions, especially in **hot climates**.

- **Water pump failures** are common ( $300 $500 to replace).

- **Thermostat and temperature sensors** wear out, leading to **overheating risks**.

- **A8 models (especially early D2s) are more prone to overheating** due to poor airflow under the hood.

4. **Transmission & Drivetrain Concerns**

- The **original **Tiptronic (automatic) transmissions** (especially in A8s) are **weak and prone to slipping or failure** ( $2,000 $3,500 to rebuild).

- **Manual transmissions (in A6s) are more reliable** but still require **regular fluid changes**.

- **Differential and driveshaft issues** (especially in A8s) can be costly to repair.

5. **Electrical & Computer Issues**

- **ECU (Engine Control Unit) failures** can occur, requiring **reflashing or replacement** ( $500 $1,200).

- **Sensors (MAF, IAC, crankshaft position) fail frequently** and must be replaced.

- **Modern OBD-II diagnostics** can be tricky, requiring **specialized tools** for some issues.

6. **Rust & Body Corrosion (Especially in A8s)**

- **A8s (D2) are notorious for rust**, particularly in **welded seams, wheel wells, and undercarriage**.

- **A6s (C4) are more rust-resistant** but still require inspection.

- **Roof leaks** (in A6s) and **window regulator failures** are common.

7. **High Maintenance Costs Over Time**

- While parts are available, **labor costs add up** (especially in Europe or for specialized work).

- **Modern emissions regulations** mean some modifications (like **catalytic converter deletions**) are **illegal** in many regions.

- **Suspension components (ball joints, control arms, bushings) wear out** and must be replaced ( $500 $1,500 per corner).

8. **Fuel Economy & Modern Standards**

- **MPG is poor for a V8** ( 12 16 MPG combined), making it **expensive to run** compared to modern turbocharged engines.

- **No-start issues** can occur if **battery, alternator, or fuel pump** fails (common in older cars).

9. **Resale Value & Market Demand**

- **Not a high-demand classic**, so resale value depreciates faster than **BMW M5s, Porsche 911s, or Mercedes AMGs**.

- **Restoration costs can be high** if the car is in poor condition.

10. **Modern Driving Experience Limitations**

- **No modern safety features** (no ESP, poor crash structure in some A8s).

- **Poor fuel injection reliability** compared to modern **direct injection systems**.

- **Less refined ride** than newer Audis, especially in **A8s (which are heavy and stiff)**.

---

### **Conclusion**

- **Appreciates classic Audi character** and doesn t mind **regular maintenance**.

- **Plans to keep the car in good condition** (timing belt, valve adjustments, cooling system updates).

- **Enjoys modifying and tuning** the engine for better performance.

- **Is okay with higher running costs** (fuel, insurance, occasional repairs).

- **Casual drivers** who want a **low-maintenance, modern luxury car**.

- **Those who prioritize fuel efficiency** over V8 power.

- **Buyers who dislike mechanical issues** (cooling, electrical, transmission).

- **People who want a high-resale-value classic** (better options exist in the **BMW M5, Porsche 911, or Mercedes AMG** realms).

---

### **Recommendation**

You **love the 4.2L V8 sound and feel** and want a **driving experience** that feels like **old-school Audi luxury**.

You re **prepared for regular maintenance** (timing belt, valve adjustments, cooling system upgrades).

You **plan to modify it** (headers, exhaust, tuning

Details:

Genuine Audi Parts. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. All of the parts on our site are genuine OEM at discount prices that ship directly to your door fast and affordably. Electrical parts are not returnable.

Audi Mid West. Parts must be resalable and in the original packaging.

part #: 4g5807251 prices

• $23.75-$24.73

specifications frontbumperus:

• for makes: Audi
• mpn: 4g5-807-251
• part type: Bumper
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• parts included: Only Part Reference 5 On The Diagram Is Included

seller frontbumperus:

• rating: 99.8%
• city: Omaha, Nebraska
• # reviews: 3753

returns frontbumperus:

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

payments frontbumperus:

• credit card: Discover
• wallet: Google-pay
• other

offer frontbumperus:

• availability: In Stock
• quantity: 1
• options: Ship-to-home
• sold: 0
• started: May 15, 2026

general frontbumperus:

• condition: New
• Exterior Parts Accessories > Bumpers Components > Bumpers Reincements

shipping frontbumperus:

• class: Standard
• transit: 4-6 Days
• cost: $9.15
• service: Standard
• type: Fixed

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