2003 Audi A6 Quattro Service and Repair Manual

This 2003 Audi A6 Quattro factory service and repair manual is built around the specific engine and trim combination on your build sheet, so the torque values, wiring diagrams and diagnostic trees you get are the ones Audi issued for the 3.0L V6 (AVK), 2.7L turbocharged V6 (BEL) or 4.2L V8 (AWN) actually under your hood, not a generalized A6 procedure.

Engines covered

• 3.0L V6 — DOHC, naturally aspirated, gasoline
• 2.7L V6 — DOHC, turbocharged, gasoline
• 4.2L V8 — DOHC, naturally aspirated, gasoline

Body styles covered

• 4-door sedan
• 4-door wagon

Trims covered

• Base
• Avant
• S Line

Known issues on the 2003 A6 Quattro. Seven recalls are on federal record for this model year. Two cover the fuel tank rollover valve: aging plastic combined with bending stress on the aluminum ventilation line can crack the valve nipple, and a resulting fuel leak near an ignition source can lead to a vehicle fire. Two more cover the fuel pump, where changed electrical motor components can render the pump inoperative and stall the vehicle without warning. Two cover the electrical system: a headlight switch connector short from contact between pins can lead to overheating or fire, and separately a knee bolster contacting the headlight switch wiring harness can short and start a fire in the left dashboard area. The last covers the driver's frontal air bag, where an improperly positioned igniter will not activate the air bag in a crash. Owners have filed 71 complaints for the year. The factory diagnostic and repair procedures behind each of those systems are here.

From tracing a fuel pump stall to inspecting the tank rollover valve or the headlight switch harness routing, it keeps you on the OEM procedure and the correct specification for your specific 2003 A6 Quattro.