Here is a detailed description of the Volkswagen Golf Mk6 1.4 TSI (CAV engine) gearbox:

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Engine Overview

• Engine Code: CAV (also known as CAVD)
• Type: 1.4L TSI (Twincharged – turbocharged + supercharged)
• Displacement: 1390cc
• Power Output: ~160 PS (118 kW)
• Torque: ~240 Nm
• Fuel System: Direct injection
• Common Models: Golf Mk6, Scirocco, Passat B6/B7, Jetta

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Gearbox Types

The Golf Mk6 1.4 TSI (CAV) typically comes with two gearbox options:

1. 

7-Speed DSG Automatic (DQ200)

• Type: Dual-Clutch Transmission (dry clutch)
• Code: DQ200
• Speeds: 7-speed
• Clutch Type: Dry clutch
• Torque Rating: Up to ~250 Nm
• Common Issues: Mechatronic failure, clutch wear, juddering
• Use: Efficient for urban and highway driving, fast gear shifts

2. 

6-Speed Manual Transmission

• Speeds: 6-speed manual
• Smoothness: Reliable and simpler than DSG
• Preferred For: Drivers who prefer manual control and fewer electronics

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Gearbox Features

• Tiptronic (for DSG): Manual shift mode on automatic
• ECU Integration: Gearbox ECU is integrated into the mechatronic unit (for DSG)
• Cooling: DSG requires proper cooling; overheating can cause damage
• Fluid: Use only VW-approved DSG fluid (for automatic)

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Known Problems (DQ200 DSG)

• Clutch pack wear
• Mechatronic unit failure
• Software update needed in some models
• Rough shifting or delayed engagement

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Maintenance Tips

• DSG fluid change every 60,000 km (though VW initially claimed ''lifetime'')
• Manual gearbox uses standard gear oil, check levels periodically
• Avoid aggressive acceleration at low speeds (for DSG longevity)
• Update DSG software if recommended

Let me know if you want part numbers, gearbox codes, or compatibility with other models.