Audi 80, 90 & Coupe Service & Repair Manuals
The Audi 80 and 90 series, alongside the iconic B3 Coupe, represent the era when Audi established its "Vorsprung durch Technik" reputation in the UK. With fully galvanised bodies and the introduction of the legendary five-cylinder engines, these cars were built to last - but keeping them on the road today requires accurate technical guidance.
Whether you prefer a physical book by your side in the garage or the convenience of a digital version on your phone, our manuals provide the exact torque settings, fluid capacities, and step-by-step instructions you need. Choose from a Printed Manual, a Digital Online Manual, or our Best Value Bundle which gives you both.
Technical Guidance for Classic Audi Engines
This manual covers an extensive range of petrol engines used across the 80, 90, and Coupe models from 1986 to 1990:
- Four-Cylinder Units: Detailed service data for the 1.6, 1.8, and 2.0-litre units (Engine codes: RN, DZ, JN, NE, PM, 3A). These engines are known for their longevity but often need attention to aging vacuum hoses and fuel injection seals.
- The Five-Cylinder Legacy: Comprehensive coverage for the 2.0, 2.2, and 2.3-litre five-cylinder engines (PS, KV, NG). Our manual helps you master the unique timing belt procedures and Bosch K-Jetronic or KE-Jetronic fuel systems.
- The High-Performance 20V: Specific data for the 7A and NM 20V engines, ensuring you can accurately maintain the more complex valvetrain and multi-point injection systems.
Choose the Format That Fits Your Workshop
Print & Online Bundle (Best Value)
Get the best of both worlds. You’ll receive the trusted physical workshop manual despatched from our UK warehouse, plus instant access to the interactive online version. Use the book for heavy work in the garage and the digital version for quick searches and bonus video content.
Printed Manual
The classic Haynes book. Perfect for those who want a permanent, oily-fingered reference on their workbench. It features step-by-step instructions based on a full strip-down and rebuild, supported by hundreds of photos.
Online Manual
Get instant access on any smartphone, tablet, or laptop. The digital edition includes everything in the printed book plus:
- Colour photography and zoom functionality.
- Interactive Fault Finder to diagnose 400+ common issues.
- Bonus DIY video tutorials for common maintenance tasks.
- Clearer wiring diagrams that are easier to follow on-screen.
FAQ: Audi 80, 90 & Coupe Maintenance
Q: Where can I find my engine code?
A: You can usually find the three-letter engine code (like DZ, NG, or 7A) on a sticker in the boot’s spare wheel well or stamped onto the engine block itself.
Q: Does this manual cover Quattro models?
A: This specific manual focuses on the front-wheel-drive versions of the 80, 90, and Coupe. While much of the engine and interior data is the same, the unique Quattro rear drivetrain and suspension are not covered here.
Q: My five-cylinder engine is "ticking" when cold. What should I do?
A: This is often caused by the hydraulic tappets. Our manual provides the oil pressure test procedures to help you decide if you need a simple oil change or if the tappets need replacing.
Keep Your Classic Audi Moving
Don't let a mechanical issue keep your Audi 80, 90, or Coupe off the road. With a Haynes Manual, you have the information needed to perform everything from a basic oil service to a full cylinder head gasket replacement.
