Audi A4 1.8T, 2.0T, 2.4, 2.7T, 3.2 2002-2008 Repair Manual OEM (P/N C4085-91017)

• Engine mechanical coverage for the 2006 Audi A4 2.0L 4-cylinder 4V Turbo, identified by BPG and BWT engine codes, with engine identification and assembly reference data.
• Timing-belt and sealing-flange repair coverage, including belt tensioning, lock-carrier removal and installation information, and related assembly overviews.
• Turbocharger and charge-air connection procedures address hose coupling assembly, retaining clips, and sealing-ring precautions.
• Component-specific tightening data covers engine assembly, knock-sensor attachment, and the staged flywheel-bolt tightening procedure.
• Separate 2005 Audi A4 system wiring diagrams include data-link connector circuits and control-module connections, with equipment and production-version distinctions.
• General repair material addresses automatic transaxle installation and transaxle-mount inspection and replacement, with a clear boundary between these jobs and specialist internal transmission work.

Engine Mechanical and Assembly Details

The documentation maps out the removal and installation parameters for major subassemblies. Assembly overviews cover the lock carrier and toothed-belt drive, while component references identify the mass air flow (MAF), coolant-temperature, and oil-pressure units. These sections place the named components alongside the engine assembly information needed to plan the work.

The charge-air material goes beyond a general hose-routing overview. Its “Identifying Hose/Tube Retaining Tabs” illustration accompanies the connection-coupling assembly procedure. A specific repair warning explains that installing a coupling with its retaining clip already locked can damage the sealing ring and cause a leak.

Working on high-pressure fuel injection components and turbochargers demands strict adherence to safety protocols and cleanliness standards to prevent system contamination or personal injury during pressure release.

Technical Specifications and Data

Engine identification is tied to the code and serial number at the engine/transmission joint and on the timing-belt-cover sticker. The engine code also appears on the vehicle data plates. This identification information helps distinguish the covered engine configuration before repair procedures or assembly specifications are selected.

The engine-data table supplies performance and compression information alongside fuel-injection, ignition, and valve-timing characteristics. Tightening requirements are presented as component-specific reference data rather than a single general fastener chart.

References to the intake air temperature sensor G42 and throttle valve control module J338 retain the component designations used in the documentation. Intake manifold runner and electrical connection information accompanies the mechanical material; these references identify the relevant parts without treating an assembly illustration as a complete diagnostic procedure.

Electrical Diagrams and Connection Details

The data-link connector wiring diagram shows connections to the Motronic engine control module, transmission control module, and comfort-system central control module. Convertible-equipment and early/late-production notations distinguish applicable circuit connections.

Alongside the engine assembly overviews, the hose/tube retaining-tab view and transaxle side-mount illustration show how particular connections and attachments are arranged. The electrical diagram adds circuit relationships rather than merely showing where components sit.

Automatic Transaxle Scope and Section Applicability

The general repair material discusses torque-converter engagement and driveplate alignment during installation, together with sealing components and related fluid-level and shift-cable checks. Its side-mount illustration identifies the mounting attachments addressed in the replacement procedure.

Specialist automatic transaxle diagnosis and internal overhaul are outside the general manual’s scope. The installation and mount-service material should not be mistaken for a transmission rebuilding guide.

The PDF documentation uses section-specific coverage: the engine-mechanical material is labeled 2006, while the wiring reference is labeled 2005. Engine code, model year, and equipment distinctions matter when selecting the applicable section.