Audi A4 2002-2008 Repair Manual Collection

The general repair guide supports routine servicing, fault checks and mechanical repairs. The separate system documents provide more detailed component procedures and diagnostic references; match the engine code, drivetrain and production version before selecting a procedure.

The general guide’s automatic-transaxle coverage addresses preliminary checks, removal and installation, shift controls and mounts. Specialist diagnosis and internal automatic-transaxle overhaul are outside its scope.

PDF Search, Diagram Access and File Contents

Text search and diagram detail: The general repair guide has searchable OCR text with recognition errors and four bookmarks to document blocks rather than individual chapters. The other 15 PDFs have no embedded bookmarks. Their text can be searched, but labels within the separate wiring diagrams cannot. Small wiring labels require zooming; some diagrams in the general guide have vertical scan lines.

Wiring-file limitation: The separate wiring PDF contains 91 diagram images, while 41 intended diagram pages show only the running header. Captions remain for the missing diagrams, including the automatic-transmission and supplemental-restraint circuits.

The ZIP contains 16 printable PDFs totaling 5,684 pages. The individual document counts appear above. The total already includes the wiring file’s opening heading page, 132 caption pages and 41 header-only pages, along with the other documents’ contents, index and caption-only pages.

Engine Timing, Chassis Repairs and System Diagnosis

These selected contents show the range of work covered. Further topics include secondary-air system checks and tire-pressure monitoring component service.

• Engine mechanical repair: Step-by-step engine removal and installation, cylinder-head service, crankshaft and piston work, valve-train inspection, and lubrication and cooling-system procedures.

• Timing drives and turbocharging: Timing-belt replacement and adjustment, BKH timing-chain service, turbocharger removal, wastegate-actuator checks, and charge-air connection procedures.

• Fuel supply and fault references: Fuel-pump electrical and delivery tests, fuel-level sender checks, EVAP leak testing, and an AVK-specific diagnostic trouble-code index.

• Brakes and chassis: Bosch ABS component service, hydraulic leak testing and bleeding, wheel-bearing replacement, CV-joint service, alignment adjustment, and power-steering tests.

• Climate-control diagnosis: Climatronic fault-memory checks, output tests, basic settings, coding, adaptation, electrical testing, and heater/A/C component replacement.

• Body and Cabriolet repairs: Doors, glazing, interior trim, seats, airbags and seat belts, plus convertible-top adjustment, hydraulic components and operating switches.

• Electrical references: Available data-link, power-distribution, starting/charging and other system circuits distinguish equipment configurations and early/late production versions.

The general guide supports owners undertaking maintenance and mechanical repairs; the system documents suit experienced users with the specified diagnostic equipment, and the ABS section expressly requires qualified personnel.

Engine Assembly, Timing and Charge-Air Connections

The engine documents provide assembly overviews and component-specific tightening data for planning major work. References identify the mass air flow unit, coolant-temperature and oil-pressure components, intake air temperature sensor G42, and throttle valve control module J338, alongside intake-runner and electrical connections.

The 3.0L material includes camshaft-adjustment testing and a “Toothed Belt Drive, Assembly Overview.” The BKH document treats the rear timing-chain drive, chain tensioners and balance-shaft drive separately from belt-driven engines.

The charge-air connection procedure includes an “Identifying Hose/Tube Retaining Tabs” illustration. It warns that installing a coupling with its retaining clip already locked can damage the sealing ring and cause a leak.

Dual-mass flywheel instructions also warn against impact-tool removal because it can damage the flywheel. Working on high-pressure fuel injection components and turbochargers demands adherence to the stated pressure-release precautions and cleanliness requirements.

Fuel Diagnosis and Climate-Control Matching

Fuel-supply procedures distinguish front-wheel-drive and all-wheel-drive tanks and production versions. Electrical checks, delivery-rate tests and fuel-pump control module J538 tests help separate supply faults from a simple component-location reference.

The AVK trouble-code index pairs SAE and VAG codes with descriptions and corrective-action references. Its camshaft-adjustment entries can be used alongside the corresponding tests in the engine document.

Climatronic material covers J255 fault diagnosis and replacement-related basic settings. Its production-specific control-head and sunlight-sensor assignments help avoid selecting incompatible components.

Brakes, Steering and Cabriolet Systems

Brake procedures distinguish Bosch 5.7 and 8.0 ABS equipment and individual caliper designs. The suspension document adds wheel-bearing and control-arm work, alignment checks, Servotronic electrical tests, steering-system bleeding and pump-pressure testing.

Separate Cabriolet sections address top locks and linkage adjustment, the convertible-top hydraulic system, position switches and control module J256. The interior documents distinguish seat configurations and provide airbag, seat-belt and trim procedures.

Transaxle Installation and Circuit Relationships

The general guide covers torque-converter engagement, driveplate alignment, sealing components, fluid-level checks and shift-cable adjustment. Its “Transaxle Side Mounts” illustration accompanies mount inspection and replacement.

The separate “Data Link Connector Circuit” shows connections between the diagnostic connector, Motronic engine control module, transmission control module and comfort-system central control module. “Power Distribution Circuit” diagrams add fuse, relay and supply relationships, with convertible-equipment distinctions.

A Preview of Oil-Pressure Test Specifications

For BPG/BWT engines, the oil-pressure test specifies 2.7–4.5 bar at 2,000 rpm with the oil at 80°C. The accompanying F1 oil-pressure switch test gives a switching range of 1.2–1.6 bar positive pressure. The section identifies oil-pressure tester V.A.G 1342 and the associated electrical test equipment.