1991 Audi 80 Service and Repair Manual

This 1991 Audi 80 factory service and repair manual is built around the Base sedan and its 2.3L l5 (engine code NG), so the torque values, clearances, and procedures inside match what Audi documented for this exact powertrain rather than an approximation drawn from another 80 variant.

Engines covered

• 2.3L inline-five — SOHC, naturally aspirated, gasoline

Body styles covered

• 4-door sedan

Trims covered

• Base

Known issues on the 1991 Audi 80. Two recalls are on federal record for this model year. The first covers the transaxle: differential oil is lost over time to evaporation, and the resulting low oil level causes premature bearing and gear wear that can lead to drive wheel power loss or, in extreme cases, front wheel lockup, rapid deceleration, and loss of vehicle control. The second covers the front airbag sensor and control module, which can fail to meet Audi's durability standards over the life of the vehicle and inadvertently deploy the airbag without warning, risking loss of vehicle control. Owners have filed 2 complaints for the year. The factory diagnostic and repair procedures behind both systems are here.

From a transaxle oil-level check to an airbag sensor inspection, it keeps you on the OEM procedure and correct specification for your specific 1991 Audi 80.