The Audi Q7 3.0 TDI (CJG engine code) uses a common rail direct injection system with piezoelectric fuel injectors designed for high-pressure fuel delivery. Here’s a detailed description of the injector system:

 

Injector Overview (CJG 3.0 TDI Engine)

• Engine Code: CJG
• Engine Type: 3.0L V6 Turbocharged Diesel (TDI)
• Injection System: Common Rail Direct Injection (Bosch system)
• Injector Type: Piezoelectric injectors
• Operating Pressure: Up to 2000 bar
• Control: ECU-controlled via high-speed solenoids or piezo elements
• Injector Part Number Examples:
  
• Bosch: 0445116045 / 0445116046 (varies by year and market)
• VAG OEM ref: 059130277BA / 059130277BC (check specific VIN for accuracy)
• 
  

 

Injector Functionality

• Precisely meters diesel fuel into each cylinder for optimal combustion.
• Multi-stage injection (pre-injection, main injection, and post-injection) for improved efficiency and reduced NOx and noise.
• Controlled electronically via the ECU based on inputs like engine load, speed, temperature, and emission requirements.

 

Common Symptoms of Injector Problems

• Hard starting or rough idle
• White/black smoke from exhaust
• Poor fuel economy
• Misfires or engine knock
• Diesel smell from engine bay

 

Maintenance Notes

• Fuel injectors are sensitive to poor-quality diesel always use clean, high-grade fuel.
• Recommended to change injectors at 250,000300,000 km, or earlier if symptoms appear.
• Must be coded to the ECU after replacement (using ODIS or VCDS tools).

If you need part numbers based on your VIN or specific year, feel free to share and I can help check the exact match.