OEM REFERENCE
PARTS CATALOG
OEM part numbers with torque specifications and cross-platform compatibility. Click any part number to copy to clipboard.
| PART NUMBER | DESCRIPTION | TORQUE | NOTES | SHOP |
|---|---|---|---|---|
| 028 903 028 D |
Alternator (90A)
1.8T AWP • 2.0 AEG/AVH |
45 Nm (mounting) | OEM Bosch 90A. 120A upgrade available from Valeo. | AMAZON → |
| 1J0 937 617 D |
Fuse/Relay Box (Under Dash)
All MK4 |
N/A | Common source of electrical gremlins. Check for corrosion and burnt contacts. | AMAZON → |
| 1J0 998 002 |
Headlight Wiring Harness
All MK4 |
N/A | Melted connectors common on MK4. Upgrade to ceramic connector kit. | AMAZON → |
| N 105 910 02 |
Glow Plug (TDI)
1.9 TDI ALH • 1.9 TDI BEW |
15 Nm | Quick-start type. Use anti-seize on threads. Check harness for melting. | AMAZON → |
| 1J0 959 801 |
Window Regulator (Front Left)
All MK4 |
N/A | Extremely common MK4 failure. Clips break causing window to fall. Replace clips or entire unit. | AMAZON → |
| 1C0 959 799 B |
Central Locking Module (Comfort)
All MK4 |
N/A | Located in driver door. Controls all locks, interior lights, alarm. Reprogram with VCDS after replacement. | AMAZON → |
| 1J0 919 861 |
Instrument Cluster (with MFI)
GLI • GTI • 337/20AE |
N/A | Multi-Function Indicator. Pixel fade is common — can be repaired. Requires immobilizer adaptation with VCDS. | AMAZON → |
UPGRADE PATH
ARP HARDWARE
Replace VW stretch bolts with reusable ARP fasteners. Superior clamping force and unlimited reuse.