This manual is a guide only. Always consult official Audi documentation for safety-critical systems. The author is not liable for damage, injury, or non-compliance with local regulations.

✔ Routine Maintenance Schedules ✔ Engine Mechanicals & Fuel Injection (Unit Injector – PD) ✔ Electrical Wiring Diagrams ✔ Turbocharger & Exhaust System ✔ Brakes, Suspension, Steering ✔ Diagnostic Trouble Codes (DTCs) [Page 1 – Introduction] About This Manual This service manual is intended for experienced DIY owners, independent workshops, and automotive technicians. It provides step-by-step repair procedures, maintenance schedules, torque specifications, and diagnostic information for the Audi A4 B6 equipped with the 1.9 TDI PD engine (Unit Injector system, codes AWX and AVF).

AWX (100 kW / 130 hp) | AVF (96 kW / 130 hp) Transmission: 5-Speed Manual (01A) / 6-Speed Manual (02M) / CVT (01J) Multitronic

If overboost or limp mode occurs, remove turbo, spray oven cleaner into exhaust housing vanes, manually cycle rod 30–50 times.