Audi A4 & TT/TTS 2008–2009 Repair Manual Set

The electrical references work together for fault tracing: circuit drawings show the connections, while the location and fuse guides identify components and assignments. The mechanical and parts publications address separate repair and parts-selection tasks.

Coverage varies by publication. The A4 BKH engine reference is separate from the TT BUB material. Several service files use Mitchell Repair Information formatting and copyright alongside OEM illustration credits; this is a compiled collection with different model, engine and publication-date assignments.

PDF Search, Diagram Detail and File Contents

Search and navigation: The BKH, DTC, filter, fuse and component-location PDFs have searchable text. The TT repair file has an OCR text layer with recognition errors. Wiring-PDF searches cover headings and captions; labels within the circuit drawings are not searchable. The parts guide has no text-search function. None of the eight PDFs has embedded bookmarks. Small labels in the checked wiring diagrams require zooming.

The ZIP contains eight printable PDFs totaling 827 pages, including one compilation-notice page in the BKH file and two duplicated pages in the TT repair file. Separate diagram-caption pages are included in the wiring guide’s listed page count.

BKH Engine Repair and TT System Coverage

These content highlights summarize selected procedures and references. Further topics include BKH brake-booster vacuum-pump replacement and TT airbag service precautions.

• BKH engine removal: Step-by-step engine/transmission removal, separation, assembly-stand setup and reinstallation, with manual-transmission and 09L automatic configurations treated separately.

• Timing and internal engine work: Timing-chain and balance-shaft drives, cylinder-head and camshaft service, crankshaft and connecting-rod work, piston/ring checks and hydraulic-support-element inspection.

• TT chassis repairs: Brake caliper and pad replacement, clutch service and bleeding, driveline removal, steering work, suspension repairs and wheel-bearing replacement.

• Cooling, fuel and HVAC: Radiator, thermostat, water-pump, fuel-filter, injector, fuel-pump, fuel-tank, blower-motor and heater-core procedures.

• Electrical fault tracing: 81 system wiring diagrams, control-module and connector-location views, fuse/relay assignments and supplemental-restraint circuits.

• Parts and fault codes: Audi/SAE trouble-code cross-references, exploded collision/body parts views, labor-reference entries and component-specific fitment notes.

For major repair work, the material is suited to experienced technicians or advanced DIY owners who already understand workshop safety and have access to lifting, diagnostic and specialty service equipment.

TT Mechanical Repairs and Variant Details

The TT repair section also covers alternator and starter replacement, camshaft and valve-lifter work, catalytic converters, crankshaft seals, cylinder heads, intake and exhaust manifolds, and oil-pan/oil-pump removal. Its reference tables cover engine identification, tune-up and fluid specifications, torque categories, wheel alignment, brakes, capacities and scheduled maintenance.

Driveline and suspension detail: Front and rear halfshafts, the rear driveshaft and rear pinion seal have separate procedures. Suspension material addresses links, struts, springs, stabilizer bars and wheel-bearing assemblies, including T10361 tooling for rear wheel-bearing service.

Circuit Tracing and Production Changes

Representative drawings include the 3.2L Engine Performance Circuit, A/T Circuit, AWD Circuit, Power Distribution Circuit, Supplemental Restraints Circuit, and early-/late-production Bi-Xenon and Cornering Headlight Circuits.

The component-location guide maps relay panels, the engine-compartment E-box, control modules, sensors and connector stations. The fuse guide distinguishes J519 relay/fuse-panel assignments through May 2009 versus from June 2009, helping match the panel layout before tracing a circuit.

The DTC table pairs Audi numeric trouble codes with SAE P-codes and fault descriptions.

BKH Engine Service and Repair Precautions

The BKH reference contains 690 numbered figures. Equipment references include VAS 6131 drivetrain support equipment, VAS 6095/6100/6101 assembly-stand and lifting equipment, T40069/T40070 timing tools, and V.A.G 1342 oil-pressure testing equipment.

Removal procedures lower the engine, transmission and subframe as an assembly. Illustrated support arrangements and assembly-stand setup help identify the lifting and fixturing equipment needed before major engine work begins.

Lubrication and cooling sections add oil-pressure testing, oil-cooler and filter-housing work, cooling-system draining/filling and leak testing, and radiator/fan service. Exhaust coverage includes front pipes, catalytic converters, manifolds and oxygen-sensor access.

An incorrectly seated 09L torque converter can damage the converter coupling and ATF pump during reassembly. The valvetrain notes warn of valve-to-piston contact from incorrect crankshaft/camshaft handling during timing work.

Follow the documented high-pressure fuel-system safety and cleanliness requirements. The BKH file identifies Simos engine management, but fuel-injection diagnosis is cross-referenced to separate material; this Engine Mechanical reference does not provide complete Simos pinout or fuel-injection diagnostic coverage.

Collision Parts, Labor References and Filter Service

The parts guide supplies exploded views for panels, bumpers, lamps, doors, roof and convertible-top areas, suspension, underbody and related assemblies. Part numbers and component-specific VIN breaks support parts selection. Labor-reference entries describe estimating operations; structural and laser-welded panel repairs are referred to specialist body-service instructions.

The separate dust/pollen filter procedure distinguishes standard filters from activated-charcoal versions used with an Air Quality Sensor.

Examples of BKH Oil-Pressure and Ring-Clearance Data

For the BKH lubrication check, the manual specifies minimum oil pressure of 1.2 bar at idle and 3.4 bar at 2,000 rpm, with the oil level correct and engine oil temperature approximately 80°C.

The BKH piston-inspection table lists new compression-ring-to-groove clearance of 0.02–0.08 mm and a wear limit of 0.20 mm.