1990 Audi 80 Quattro service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.
Built for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and use wiring diagrams and system sections to diagnose problems faster.
What’s included
- Step-by-step repair procedures and service information
- Specifications and reference data (where provided)
- Electrical coverage with wiring diagrams
- Coverage across key systems: engine, transmission, brakes, steering, suspension, HVAC, and more
Trims covered
- Base Sedan 4-Door
Engines covered
- 2.3L 2309CC l5 GAS SOHC Naturally Aspirated
Index / Table of contents
- Body
- Brakes
- Chassis Electrical
- Driveline
- Engine Cooling
- Engine Electrical
- Engine Mechanical
- Engine Performance & Emission Controls
- Fuel System
- General Information & Identification
- Heating, Ventilation, & Air Conditioning
- Hybrid & Electric Vehicle Systems
- Steering
- Suspension
- Transmission, Clutch, & Transfer Case
- Wiring Diagrams
THE DIFFERENTIAL OIL OF THE TRANSAXLE IS LOST OVER TIME DUE TO EVAPORATION. LOW OIL LEVELS CAUSE PREMATURE BEARING AND GEAR WEAR AND EVENTUAL FAILURE OF THE DIFFERENTIAL.
IN THE EVENT OF FAILURE, THE VEHICLE'S DRIVE WHEELS COULDLOSE POWER. IN EXTREME CIRCUMSTANCES, THE F
DRAIN AND REPLACE THE DIFFERENTIAL GEAR OIL WITH OIL HAVING HIGHER PERFORMANCE CHARACTERISTICS.
IMPROPERLY MANUFACTURED STEERING LOCK BOLTS COULD BREAK IF DRIVER APPLIES EXCESSIVE FORCE TO A LOCKED STEERING WHEEL IN AN ATTEMPT TO DISENGAGE THE STEERING LOCK.
BOLT BREAKAGE WOULD CAUSE STEERING WHEEL TO REMAIN LOCKED EVEN AFTER THE DRIVER TURNS THE IGNITION K
REPLACE COMPLETE STEERING LOCK ASSEMBLY, INCLUDING A MODIFIED LOCK BOLT.
VEHICLE DESCRIPTION: PASSENGER VEHICLES. SOME AIR BAG SENSORS DO NOT COMPLY WITH AUDI'S DURABILITY STANDARDS OVER THE LIFETIME OF THE VEHICLE.
IN THE EVENT THE SENSOR SHOULD MALFUNCTION, THE AIR BAG RESTRAINT SYSTEM CAN INADVERTENTLY DEPLOY.
DEALERS WILL REPLACE THE AIR BAG SENSOR CONTROL MODULE.
THE BATTERY DIED, CALLED AAA AND HAD THE BATTERY RECHARGED. THEN TURNED THE IGNITION ON AND THE DRIVER'S SIDE AIRBAG DEPLOYED, AND THREW THE CONSUMER MORE THAN 5 FEET AWAY INTO A BRICK WALL. *AK TH
THE BATTERY DIED, CALLED AAA AND HAD THE BATTERY RECHARGED. THEN TURNED THE IGNITION ON AND THE DRIVER'S SIDE AIRBAG DEPLOYED, AND THREW THE CONSUMER MORE THAN 5 FEET AWAY INTO A BRICK WALL. *AK TH
WHILE DRIVING AT 55 MPH THE FRONT WHEELS LOCKED WITHOUT WARNING. THE DEALER STATED THAT THE TRANSAXLE SEIZED. *AK *NM
THERE IS LEAKAGE IN SEAL OF THE FRONT AXLE SHAFT. I FEAR THAT IF IT CONTINUES THEN IT COULD CAUSE A BIG STEERING FAILURE
THERE IS LEAKAGE IN SEAL OF THE FRONT AXLE SHAFT. I FEAR THAT IF IT CONTINUES THEN IT COULD CAUSE A BIG STEERING FAILURE
Showing the 5 most serious of 12 complaints filed with NHTSA.
