Description
Factory Audi 90 Workshop Manual (1987–1996)
This factory-level repair manual covers every Audi 90 sold in North America and abroad across two generations — the B3 (Type 89) and B4 platforms — giving technicians and enthusiasts the same reference material used by Audi-authorized service centers.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | 2.0L inline-4 (3A, AAD); 2.3L 5-cyl 10v (NG, NF); 2.3L 5-cyl 20v (7A); 2.8L V6 (AAH) |
| Diesel | 1.9L turbodiesel (B4 platform) |
| Transmissions | 5-speed manual; 3-speed automatic (B3); 4-speed automatic (B3/B4) |
| Drive | FWD; Quattro permanent AWD |
| Model Years | 1987–1996 (B3: 1987–1992; B4: 1992–1996) |
| Badge Twins | Audi 80 (shared B3/B4 platform); Volkswagen Passat B3/B4 |
Common Audi 90 Repairs Covered
| System | Procedures |
|---|---|
| CIS/Motronic Fuel Injection | Idle adjustment, injector testing, cold-start valve replacement, warm-up regulator service |
| Quattro Differential | Center and rear differential fluid service, Torsen differential rebuild, driveshaft boot replacement |
| Cooling System | Thermostat replacement, coolant flush, radiator and water pump service on 2.3L 5-cylinder engines |
| ABS Brake System | ABS hydraulic unit bleeding, wheel speed sensor diagnosis, brake pad and rotor replacement procedures |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Does this manual cover both the B3 and B4 Audi 90 generations?
Yes. The manual addresses both generations in full. The B3-platform Audi 90 (1987–1992) is covered in English and includes the 2.0L and 2.3L engines with CIS and Motronic fuel injection. The B4-platform Audi 90 (1992–1996) is covered in Spanish and adds the 2.8L V6, 1.9L turbodiesel, and Avant wagon body style alongside sedan and coupe variants.
Is the Audi 90 related to any other models in this manual?
The Audi 90 shares its B3 and B4 platforms with the Audi 80 and the Volkswagen Passat of the same era. Many mechanical procedures — particularly suspension, braking, and drivetrain — overlap significantly between these badge twins, making this manual a valuable cross-reference for related vehicles.
Are wiring diagrams included for the Quattro AWD system?
Yes. Complete electrical documentation covers the Quattro drivetrain management, ABS circuits, engine management wiring for all fuel-injection variants, climate control, central locking, and instrument clusters. Diagrams include color-coded conductors, connector pin assignments, and ground-point locations for systematic fault diagnosis.
What format is the manual?
The manual is delivered as a PDF file available for instant download after purchase. It is fully searchable, zoomable for detailed diagrams, and compatible with Windows, Mac, Linux, iOS, and Android devices. Individual pages or full sections can be printed for bench use.
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