The Bosch diesel fuel injector with part number 0445102991 is a common rail injector used in various diesel engines. Here are the key details about it:

Bosch Injector 0445102991 – Key Information:

• Type: Common Rail Diesel Fuel Injector (Solenoid-controlled)

• Applications: Used in several diesel engines, including:

• Volkswagen (VW) / Audi: Some 2.0 TDI engines (e.g., CJCA, CFFB)

• Other European diesel engines (confirm compatibility with your specific engine)

• Nozzle Type: High-precision Bosch nozzle for efficient fuel atomization

• Pressure Rating: Designed for high-pressure common rail systems (up to 1800 bar or higher, depending on the engine)

• Electrical Connector: Bosch EV-style connector (standard for many modern diesel injectors)

Common Symptoms of a Failing Injector:

• Engine misfires or rough idle

• The Bosch diesel fuel injector 0445102991 is a solenoid-controlled common rail injector with several advanced features, particularly due to its integrated control valve. Here’s a breakdown of its key features and functionalities:

• 1. Solenoid-Controlled Valve (High-Speed Switching)

• Uses an electromagnetic solenoid for precise fuel metering.

• Enables ultra-fast opening and closing (response time in milliseconds) for accurate injection timing.

• Operates at high pressures (up to 1800 bar or more) in modern common rail systems.

• 2. Two-Stage Control Valve Design

• The injector has a hydraulically amplified servo valve system, which means:

• A small solenoid valve controls a larger hydraulic valve, improving response time.

• Reduces the electrical energy needed while maintaining high precision.

• 3. High-Precision Nozzle & Multi-Hole Design

• Micro-machined nozzle holes (typically 6-8 holes) for optimal fuel atomization.

• Ensures efficient combustion, reducing emissions (soot & NOx) and improving fuel economy.

• 4. Pressure-Balanced Design

• Uses hydraulic compensation to maintain consistent injection quantity regardless of rail pressure fluctuations.

• Prevents dribbling (leakage after injection) for cleaner cuts.

• 5. Integrated Sensors & Adaptive Calibration (In Some Models)

• Some Bosch injectors (like those in newer VW/Audi applications) include IQ (Injection Quantity) adaptation.

• The ECU can auto-calibrate injector offsets to compensate for wear over time.

• 6. Robust Materials & Construction

• Hardened steel nozzle & needle for long-term durability.

• High-temperature-resistant seals to withstand extreme heat in modern diesel engines.

• Increased fuel consumption

• Black smoke from exhaust

• Hard starting or poor acceleration

• Diagnostic trouble codes (DTCs) like P020X (injector circuit malfunction) or P026X (cylinder contribution imbalance)

Replacement & Servicing Tips: