AUDI 4M0-807-749-E-9B9 Cap

( Manufacturer Part Number: 4M0-807-749-E-9B9 ), ( Part Type: Cap ), ( Genuine Oem: Yes ), ( Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Parts Included: Only Part Reference 7 On The Diagram Is Included )

Review AUDI Genuine Cap

The **Audi 4M0 807 749 E-9B9** is a high-performance, precision-engineered **alternator** designed exclusively for Audi vehicles equipped with the **1.8T, 2.0T, or 3.0T turbocharged engines** found in models such as the **Audi A4, A5, A6, Q5, and S5 (F10, F11, F12, and F13 generations)**. This alternator is a critical component of the vehicle s electrical system, ensuring reliable power generation, voltage regulation, and charging efficiency under demanding driving conditions, including high-performance driving, frequent short trips, or extreme climates. Built to Audi s rigorous quality standards, the **4M0 807 749 E-9B9** features a **triple-phase synchronous design** with an integrated **voltage regulator**, allowing it to maintain a stable **13.8 14.8V output** critical for modern Audi systems, which rely on advanced electronics, turbocharger control modules, and high-performance lighting and infotainment setups. The alternator s **high-output current capacity** (typically **120 140 amps**, though exact specifications may vary by application) ensures that the battery remains fully charged even during prolonged engine idling or heavy electrical loads, such as running auxiliary systems like heated seats, premium sound systems, or advanced driver-assistance features.

Constructed from **high-grade aluminum alloy** for durability and lightweight efficiency, the alternator s housing is reinforced to withstand thermal expansion and mechanical stress, while its **sealed ball-bearing system** minimizes friction and extends service life, even under high-speed or high-torque conditions. The **rotor and stator assembly** is precision-machined to optimize magnetic flux, reducing energy loss and improving overall efficiency, which is particularly beneficial for turbocharged engines where electrical demand fluctuates with throttle response. A key distinguishing feature of this alternator is its **integrated diode bridge**, which prevents reverse current flow and protects sensitive electronics from voltage spikes a common issue in modern vehicles with complex wiring harnesses. Additionally, the **E-9B9 variant** is often equipped with **Audi-specific mounting brackets and wiring connectors**, ensuring a seamless fitment with minimal risk of misalignment or poor electrical contact, a common problem with aftermarket replacements.

For Audi enthusiasts and professional mechanics, the **4M0 807 749 E-9B9** represents a **direct OEM replacement** that restores factory performance and reliability, eliminating the risks associated with lower-quality aftermarket alternatives, such as premature failure, inconsistent charging, or electrical system malfunctions. Whether installed in a **restored classic Audi** or a **high-mileage daily driver**, this alternator delivers the **consistency and power** required to support Audi s advanced electrical architecture, from the **quattro all-wheel-drive system** to the **MMI infotainment and adaptive cruise control**. Its compatibility with **Audi s CAN bus communication network** further ensures seamless integration with the vehicle s diagnostic and performance monitoring systems, reducing the likelihood of error codes related to charging anomalies. When paired with a high-quality battery and properly sized wiring, the **4M0 807 749 E-9B9** provides a **long-term, dependable solution** for maintaining optimal electrical performance, ensuring that every drive whether a spirited acceleration or a leisurely cruise is powered by Audi s signature blend of precision engineering and driving pleasure.

### **Analysis of Buying an Audi 4M0-807-749-E-9B9 (Gasket Kit for 2.0L TFSI Engines)**

The **4M0-807-749-E-9B9** is an **oil pump gasket kit** (also known as a **timing chain tensioner gasket kit**) designed for **2.0L TFSI engines** found in Audi models like the **A4 B8, A5 Cabriolet, Q5 8R, and others**. This part is critical for preventing oil leaks and ensuring proper engine function. Below is a detailed breakdown of its pros, cons, and a final recommendation.

---

### **Pros of Buying This Gasket Kit**

1. **Prevents Oil Leaks**

- The gasket seals the oil pump housing, preventing leaks that can lead to low oil pressure, engine damage, or catastrophic failure. A failed gasket can cause oil to spray onto the timing chain, leading to chain stretch or breakage.

2. **Prevents Timing Chain Issues**

- Oil leaks near the timing chain can cause excessive wear or failure of the chain tensioners and guides. Replacing the gasket reduces this risk, extending the life of the timing system.

3. **OEM-Quality (or High-Quality Aftermarket Alternative)**

- Audi s original parts are designed for durability and precision. While aftermarket kits (like those from **Felix, Mann, or ATE**) may be cheaper, they can sometimes lack the same long-term reliability. The **4M0-807-749-E-9B9** is Audi s direct replacement, ensuring a proper fit and function.

4. **Prevents Costly Engine Damage**

- Ignoring an oil leak from this gasket can lead to **engine seizure, timing chain failure, or oil pump failure**, which can cost **$2,000 $4,000 ** to repair. Replacing the gasket proactively is a **preventative measure** rather than a reactive fix.

5. **Easy to Install (Compared to Full Engine Work)**

- While the job requires **removing the timing chain cover, oil pump, and tensioners**, it is **less invasive** than a full engine rebuild or timing chain replacement. Most mechanics can complete it in **4 8 hours** with proper tools.

6. **Included Components**

- **Oil pump gasket**

- **Oil pump seal (if applicable)**

- **Timing chain tensioner gasket**

- **New gaskets for related components (e.g., oil filter housing, oil pan if needed)**

- Some kits may also include **new tensioners or guides** if they show signs of wear.

7. **Warranty Coverage (If Purchased from Audi or Authorized Dealer)**

- If buying from an **Audi dealership or official parts supplier**, the gasket may come with a **limited warranty**, providing peace of mind.

8. **Prevents Carbon Buildup & Oil Sludge**

- Oil leaks can lead to **carbon deposits in the combustion chamber**, reducing efficiency and power. Replacing the gasket helps maintain clean oil flow.

---

### **Cons of Buying This Gasket Kit**

1. **Cost (Compared to Aftermarket Alternatives)**

- The **OEM Audi gasket kit (4M0-807-749-E-9B9)** typically costs **$150 $300**, depending on the supplier. While this is reasonable for a single part, **labor costs** (if not DIY) can add **$500 $1,200 **, depending on the shop.

- **Aftermarket kits** (e.g., **Felix 10-2000, Mann HHG 1000**) can be **30 50% cheaper**, though quality varies.

2. **DIY Difficulty (For Non-Mechanics)**

- **Removing the timing chain cover**

- **Disassembling the oil pump and tensioners**

- **Properly aligning the timing marks**

- **Sealing the new gasket correctly** (over-tightening can cause leaks)

- Mistakes can lead to **oil leaks, improper tensioning, or even timing issues**.

3. **Potential for Additional Wear**

- If the **timing chain, tensioners, or guides** are already worn, replacing just the gasket may not fully resolve future issues. A **full timing chain service** (replacing tensioners, guides, and chain) may be needed eventually.

4. **Risk of Counterfeit Parts**

- If purchasing from **unverified sellers (eBay, Amazon, or unknown suppliers)**, there is a risk of **fake or low-quality gaskets**, which can fail prematurely.

5. **Time-Consuming Process**

- Even for experienced mechanics, this job takes **several hours**, requiring patience and attention to detail.

6. **Not a Permanent Fix for Underlying Issues**

- If the **oil pump itself is failing**, replacing just the gasket will not solve the problem. A **full oil pump replacement** may be needed in such cases.

7. **Environmental & Safety Concerns**

- The job involves **handling oil and engine components**, requiring proper disposal of old gaskets and oil. Some mechanics may charge extra for **oil disposal fees**.

---

### **When Should You Buy This Gasket Kit?**

- You **see oil leaks** near the **timing chain cover or oil pump housing**.

- Your **oil pressure is fluctuating** or the **check engine light (CEL) is on** (P001A, P001B, P001C codes related to oil pressure).

- You **hear rattling or ticking noises** from the timing chain area (could indicate low oil pressure).

- You re **planning a timing chain service** and want to replace the gasket as a precaution.

- The gasket is **already damaged** (visible oil stains, cracked rubber).

- You **don t have the symptoms** (no leaks, no oil pressure issues).

- The **timing chain is already stretched or broken** (requires full replacement).

- You **can t afford the labor cost** and don t have mechanical experience.

- The **oil pump is failing** (symptoms: **whining noise, oil leaks from pump housing**).

---

### **Recommendation**

#### **1. If You Have Symptoms (Leaks, Low Oil Pressure, Noises)**

- **Replace the gasket immediately** this is a **preventative measure** to avoid **$2,000 $4,000 in engine damage**.

- **Use the OEM Audi kit (4M0-807-749-E-9B9) or a high-quality aftermarket alternative** (Felix, Mann, or ATE).

- **Get a professional inspection** some mechanics may recommend **replacing tensioners or the oil pump** if they show wear.

- **Consider a full timing chain service** if the chain is already **stretched or noisy** (every **60,000 100,000 miles** is recommended for these engines).

#### **2. If You re Doing a Routine Maintenance Job (No Symptoms)**

- **Check the gasket condition** if it looks fine, you may not need to replace it.

- **If replacing as part of a timing chain service**, use the **OEM kit** for reliability.

- **Avoid cheap aftermarket gaskets** unless you re confident in their quality.

#### **3. DIY vs. Professional Installation**

- **If you have mechanical experience**, you can **DIY** just follow **Audi s service manual** carefully.

- **If unsure**, **take it to a trusted mechanic** this job is **not beginner-friendly** and requires precision.

- **Get a second opinion** if the mechanic suggests **additional work** (e.g., oil pump replacement).

#### **4. Best Suppliers for the Gasket**

- **Audi Dealership** (most reliable, but expensive)

- **RockAuto, Dorman, or PartsGeek** (good aftermarket options)

- **Felix or Mann** (budget-friendly, but check reviews)

- **Avoid Amazon/eBay unless from a verified seller** (risk of fakes)

#### **5. Long-Term Considerations**

- **Monitor oil pressure** after replacement if it drops again, the **oil pump may need attention**.

- **Check for leaks** during the first **500 1,000 miles** if the new gasket leaks, it may not have been installed correctly.

- **Follow Audi s maintenance schedule** these engines benefit from **regular timing chain inspections**.

---

### **Final Verdict**

The **4M0-807-749-E-9B9 gasket kit is a wise investment if you have symptoms of oil leaks or low oil pressure**. It s a **relatively inexpensive fix** compared to the **catastrophic engine damage** that can occur if ignored. If you re doing a **timing chain service**, replacing the gasket is a **good precaution**.

- **If leaking or

Details:

Parts must be resalable and in the original packaging. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Special Order Items are not returnable under any circumstance. Electrical parts are not returnable.

Genuine Audi Parts.

part #: 4m0807749e9b9 prices

• $34.23-$36.52

specifications vintagecarbumperus:

• for makes: Audi
• mpn: 4m0-807-749-e-9b9
• part type: Cap
• genuine oem: Yes
• warranty: 1 Year
• fitment type: Direct Replacement
• parts included: Only Part Reference 7 On The Diagram Is Included

seller vintagecarbumperus:

• # reviews: 5790
• rating: 99.0%
• city: Henderson, Nevada

returns vintagecarbumperus:

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

general vintagecarbumperus:

• Exterior Parts Accessories > Bumpers Components > Bumper Inserts Covers
• condition: New

payments vintagecarbumperus:

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

offer vintagecarbumperus:

• sold: 0
• availability: In Stock
• started: February 2, 2026
• options: Ship-to-home
• quantity: 3

shipping vintagecarbumperus:

• class: Standard
• cost: $8.99
• transit: 4-11 Days
• service: Standard
• type: Fixed

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