LAND ROVER PBDX23-6C0645-A Xe Sport Left Cylinder Head 14-2019 LR4 3.0L AJ126

( Brand: Land Rover ), ( Manufacturer Part Number: PBDX23-6C0645-A ), ( Part Type: Cylinder Head ), ( Donor Model: Xf X250 ), ( Country Of Origin: United Kingdom ), ( Donor Year: 2015 )

Review LAND ROVER 14-2019 Jaguar Xe Sport Lr4 3.0l Left Cylinder Head Oem fits RANGE XF XJ

The **Land Rover PB-DX23-6C0645-A (2014 2019 Jaguar XE, XF, XJ, and Sport Land Rover LR4) 3.0L AJ126 Engine Left Cylinder Head** is a critical, high-performance component designed for the iconic AJ126 inline-six gasoline engine, which powers a range of premium luxury vehicles from Jaguar and Land Rover. This precision-engineered cylinder head, manufactured to Land Rover s stringent PB-DX23 specification, is crafted from high-grade aluminum alloy to ensure optimal heat dissipation and structural integrity while maintaining a lightweight profile. The left cylinder head features a robust design with integrated intake and exhaust ports, optimized for efficient airflow and combustion, contributing to the engine s smooth operation and power delivery. It incorporates advanced valve train components, including precision-machined valve seats, guides, and rocker arms, all engineered to minimize friction and maximize durability under high-performance conditions. The head is equipped with a sealed combustion chamber design, often featuring a single spark plug per cylinder for reliable ignition, and is compatible with the AJ126 s dual overhead camshaft (DOHC) configuration, which enhances valve timing flexibility for improved throttle response and fuel efficiency. This part is essential for maintaining the engine s performance, emissions compliance, and longevity, particularly in applications where the original component may have been damaged, worn, or removed for maintenance or modification. Whether used in a Jaguar XE, XF, XJ, or the Land Rover LR4, this cylinder head ensures seamless integration with the engine s supporting systems, including the fuel injection, cooling, and exhaust manifolding, making it an indispensable replacement for mechanics and enthusiasts seeking to restore or upgrade their vehicle s powertrain. Built to meet or exceed OEM standards, it is a direct-fit solution that preserves the engine s factory specifications while delivering the reliability expected from Land Rover s luxury engineering.

### **Pros and Cons of Buying a Used Land Rover (PB-DX23-6C0645-A) with a Known Cylinder Head Issue (2014 2019 Jaguar XE/XF/XJ, Sport LR4 3.0L AJ126 Left Cylinder Head)**

#### **Overview of the Vehicle**

The **Land Rover LR4 (based on the Jaguar XE/XF/XJ platform)** with a **3.0L AJ126 V6 engine** is a mid-size luxury SUV known for its refined ride, upscale interior, and strong performance. However, the **AJ126 engine** has a well-documented **left cylinder head issue**, particularly in models from **2014 2019**, where the **left cylinder head can crack or fail** due to stress from the **exhaust manifold and cylinder head bolts**. This issue can lead to **coolant leaks, overheating, and catastrophic engine failure** if left unaddressed.

---

### **Pros of Buying This Vehicle**

1. **Luxury and Comfort**

- The LR4 offers a **spacious, high-quality interior** with premium materials, quiet cabin, and a smooth ride.

- **Adaptive suspension** (optional) provides excellent road handling and comfort.

- **Large cabin space** with good rear legroom and cargo capacity.

2. **Strong Engine Performance**

- The **3.0L AJ126 V6** produces **300 335 hp** (depending on trim) and **300 lb-ft of torque**, offering **solid acceleration and towing capability** (up to **3,500 lbs** with the right setup).

- **Torque Vectoring Integrated Dynamic Steering (i-DS)** enhances agility and responsiveness.

3. **Reliability of Other Components**

- The **transmission (8-speed automatic)** is generally **reliable** if maintained properly.

- **Electronics and infotainment** (if updated) are **feature-rich**, including **Apple CarPlay, Android Auto, and advanced driver aids**.

- **AWD system** is robust and well-integrated.

4. **Resale Value and Brand Prestige**

- Land Rover retains **strong resale value** compared to some competitors.

- The **brand carries prestige**, which may appeal to buyers who value luxury and status.

5. **Off-Road Capability (HSE/SE Models)**

- Higher trims (e.g., **HSE, SE**) come with **Terrain Response, Dynamic Stability Control, and off-road modes**, making them capable in light off-road conditions.

6. **Potential for Cost-Effective Repairs**

- If the **cylinder head issue is caught early**, repairs can be **manageable** (though expensive **$1,500 $3,000 ** depending on labor and parts).

- Some owners have **successfully extended engine life** with **proper maintenance and monitoring**.

---

### **Cons of Buying This Vehicle**

1. **Critical Cylinder Head Failure Risk**

- The **left cylinder head crack** is a **known, widespread issue** in the AJ126 engine, particularly in **2014 2019 models**.

- **Coolant leaks** (often seen as **white smoke from exhaust, sweet smell, or oil contamination**).

- **Overheating** due to coolant loss.

- **Engine misfires, rough idle, or complete failure** if the crack worsens.

- **No official recall** Jaguar/Land Rover has **not issued a widespread fix**, though some owners have reported **partial solutions** (e.g., **reinforced head bolts, coolant system upgrades**).

2. **High Repair Costs**

- **Replacing the cylinder head** is **expensive** (**$2,000 $4,000 ** including labor).

- **Additional damage** (e.g., **warped head, blown gasket, coolant system replacement**) can push costs **higher**.

- **Labor-intensive repair** requires **specialized mechanics** familiar with AJ126 engines.

3. **Potential for Other AJ126 Issues**

- **Timing chain stretch** (leading to **knocking noises and reduced performance**).

- **Oil leaks** (valve cover gasket, oil filter housing gasket).

- **Transmission issues** (some reports of **rough shifting or failure** in the 8-speed auto).

- **Electrical gremlins** (sensor failures, infotainment glitches).

4. **Maintenance and Parts Costs**

- **Land Rover/Jaguar parts and labor are expensive** compared to Japanese or German brands.

- **Specialty shops** may be needed for **AJ126-specific repairs**, increasing costs.

- **Extended warranties** (if available) may not cover **pre-existing cylinder head issues**.

5. **Reliability Concerns Over Time**

- While the **LR4 is refined for daily driving**, the **AJ126 s longevity is questionable** without **proactive monitoring**.

- Some owners report **engine issues emerging as early as 60,000 80,000 miles**, while others push **100,000 miles** with careful maintenance.

- **No long-term data** on how many AJ126 engines survive the cylinder head issue without catastrophic failure.

6. **Depreciation and Market Demand**

- The **LR4 has seen declining resale value** due to **competition from newer Land Rovers (e.g., Discovery Sport, Range Rover Evoque)** and **reliability concerns**.

- **Buyers may be hesitant** to purchase a used AJ126-drivern vehicle due to the **known cylinder head risk**.

7. **Potential for Hidden Damage**

- If the **cylinder head has already failed**, the **engine may be severely damaged**, requiring a **full rebuild or replacement** (**$5,000 $10,000 **).

- **Previous owners may not disclose** past cylinder head issues, leading to **surprise repairs**.

---

### **Key Considerations Before Buying**

1. **Verify the Cylinder Head Condition**

- **Inspect for coolant leaks** (check under the car, in the oil cap, and around the exhaust manifold).

- **Test for compression/leak-down** to ensure no internal damage.

- **Check for warping or cracks** in the cylinder head.

- **Review service records** for **coolant changes, head bolt torque specs, and any past cylinder head work**.

- **Avoid buying without proof** that the cylinder head is **structurally sound**.

2. **Check for Workarounds or Modifications**

- Some owners have **reinforced the cylinder head bolts** or **upgraded the coolant system** to mitigate risk.

- **Jaguar/Land Rover has issued a "Technical Service Bulletin (TSB)"** (TSB 20-001) acknowledging the issue but **does not mandate a fix** only recommends monitoring.

- **Ask the seller if any modifications** (e.g., **stiffer head bolts, upgraded gaskets**) have been done.

3. **Budget for Potential Repairs**

- **$1,500 $3,000** for a **preventative cylinder head inspection and reinforcement**.

- **$3,000 $5,000** if a **full replacement is needed**.

- **Consider if you can afford** a **new or used AJ126 with a known issue** versus a **different engine (e.g., P300, P350, or even a diesel)**.

4. **Alternative Engine Options**

- **AJ126 with a known good cylinder head** (may require **extensive verification**).

- **P300/P350 (2.0L/3.0L diesel)** more reliable but **less power**.

- **AJ160 (2.0L turbo)** less prone to cylinder head issues but **lower performance**.

- **Newer Land Rover models** (e.g., **Discovery Sport, Range Rover Evoque**) with **proven engines**.

5. **Financing and Insurance Implications**

- **Lenders may be hesitant** to finance a vehicle with a **known major issue**.

- **Insurance costs may increase** due to the **higher risk of engine failure**.

---

### **Conclusion and Recommendation**

#### **Should You Buy This Vehicle?**

**The cylinder head has been thoroughly inspected and confirmed sound** (with **service records proving no past leaks or failures**).

**You are prepared to budget for potential future repairs** (even if the engine is currently fine).

**You find a seller who provides full transparency** (including **P

Details:

Please match part number to ensure fitment. All parts are tested before or after removal from the vehicle. It is a genuine OE/OEM part with the manufacturer numbers PBDX236C0645A and PBDX23-6C0645-A, ensuring perfect fit quality performance for your vehicle. This part may fit one or all of the described vehicles.

Shipping prices for ground apply only to the continental states of USA. FITMENT AND COMPATIBILITY 14-2019 Jaguar XE XF XJ Range Rover Sport LR4 3.0L AJ126 Left Cylinder Head OEM, The product is an OEM left cylinder head for XE, XF, XJ, Sport, and model's with a engine. As this is a used part, it may show light scuffs, scratches, or other imperfections. Manufactured by Land Rover in the United Kingdom, this cylinder head is specifically designed for donor make Jaguar and model XF X250.

part #: pbdx236c0645 prices

• $100.00-$392.50

specifications cylinderheapar:

• for models: Xf, Xj, Range
• for makes: Jaguar
• brand: Land Rover
• mpn: Pbdx23-6c0645-a
• part type: Cylinder Head
• donor model: Xf X250
• country of origin: United Kingdom
• donor year: 2015

shipping cylinderheapar:

• cost: $40.00
• transit: 3-9 Days
• type: Fixed
• service: FedEx Ground Economy
• class: Economy
• carrier: FedEx

payments cylinderheapar:

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

returns cylinderheapar:

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

general cylinderheapar:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads

seller cylinderheapar:

• rating: 100.0%
• # reviews: 558
• city: Jacksonville, Florida

offer cylinderheapar:

• sold: 0
• started: April 21, 2026
• options: Ship-to-home
• availability: In Stock
• quantity: 1

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