Powertrain:
Engine components (block, head, intake/exhaust, cooling, lubrication), Transmission (manual, automatic, Quattro AWD components), Clutch.
Chassis:
Suspension (front, rear), Steering (rack and pinion, power steering), Brakes (front and rear discs, ABS components, hydraulic lines), Wheels and Tires.
Electrical:
Battery, starter, alternator, ignition system, lighting (headlights, taillights, interior), instrument cluster, sensors, ECUs, wiring harnesses (by section).
Body:
Exterior panels (doors, hood, trunk, fenders), bumpers, trim, glass, seals, interior trim, seats, airbags, HVAC system (components, not full diagnostics).
Fuelsystem:
Fuel tanks, pumps, lines, filters, and injectors (parts identification).
Exhaustsystem:
Exhaust manifolds, catalytic converters, mufflers, exhaust pipes, hangers, and heat shields (parts identification).
Coolingsystem:
Radiator, water pump, thermostat, hoses, expansion tank, and cooling fans (parts identification).
Lubricationsystem:
Oil pan, oil pump, oil filter housing, oil cooler (parts identification).
Climatecontrol:
A/C compressor, condenser, evaporator, blower motor, HVAC control panel, ducting (parts identification).
Interiorcomponents:
Dashboard, center console, door panels, headliner, seat components, floor mats, pedals (parts identification).
Sensorsandactuators:
Engine sensors (O2, MAF, MAP, camshaft/crankshaft position), ABS sensors, wheel speed sensors, temperature sensors (parts identification).
Lightingsystem:
Headlights, taillights, fog lights, interior dome/courtesy lights, license plate lights, bulbs, housings, and modules (parts identification).
Parts Identification:
Identification of genuine Audi parts with OEM part numbers.
Labor Estimation:
Estimated labor hours for specific repair procedures, crucial for shop quoting and DIY planning.
Component Breakdown:
Detailed diagrams showing how assemblies are constructed and which parts belong to them.
Pricing Information:
Reference pricing for parts, aiding in budgeting and cost assessment.
Torque Specifications Reference:
While not a full repair manual, a comprehensive parts catalog often includes critical torque specifications for key fasteners related to part installation.
Exploded Diagrams:
Detailed exploded views of all major assemblies to precisely identify individual parts and their relationships.
Depth:
Focuses on parts cataloging and labor times, not detailed repair procedures or diagnostic flowcharts. It's a reference for what parts are needed and how long a job *should* take, implying the need for a separate service manual for 'how-to' steps.
Oe Vs Aftermarket:
Clearly distinguishes between genuine Audi parts (OEM) and potentially applicable aftermarket equivalents, aiding in sourcing decisions.
Engine Options:
This catalog will cover multiple engine variants common to the 2003-2006 A4, including the 1.8L Turbocharged Inline-4 (BKB, AMB) and the 2.0L Turbocharged Inline-4 (BGB, BPG, BWT), as well as the 3.0L V6 (ASN, BBK) and potentially the 4.2L V8 for S4 variants (not explicitly stated, but possible in an 'all models' catalog).
Engine Codes Common:
1.8T: BFB, BKB, AMB, ALT; 2.0T: BGB, BPG, BWT, BUL; 3.0 V6: ASN, BBK; 4.2 V8 (S4): BBK.
Horsepower Torque Range:
Ranges vary by engine: 1.8T (approx. 170-190 hp), 2.0T (approx. 200-220 hp), 3.0 V6 (approx. 220-250 hp), 4.2 V8 (approx. 340 hp for S4).
Fuel Delivery:
Multi-point fuel injection (MPI) or FSI (Fuel Stratified Injection) depending on engine code; requires specific fuel pressure regulators, injectors, and fuel pumps.
Body Styles:
Sedan, Avant (Wagon), Cabriolet.
Wheelbase:
Approximately 2650 mm (Sedan/Avant), 2600 mm (Cabriolet).
Length Width Height:
Varies by body style; e.g., Sedan around 4574 mm (L) x 1766 mm (W) x 1407 mm (H).
Cargo Volume:
Sedan: ~460 liters. Avant: ~480 liters (seats up) / ~1310 liters (seats down).
Curb Weight:
Ranges from approx. 1450 kg (1.8T FWD) to over 1700 kg (3.0 Quattro or S4).
Gvwr Gcwr Availability:
While not typically found in parts catalogs, Gross Vehicle Weight Rating (GVWR) and Gross Combined Weight Rating (GCWR) data are important for safe operation and would usually be in the owner's manual.
Oil Change Interval:
Typically 5,000 to 10,000 miles (or 12 months) depending on driving conditions and oil used, often dictated by the vehicle's service indicator system (LongLife service may extend this).
Timing Belt Chain:
1.8T and 2.0T engines use a timing chain (generally maintenance-free for the life of the engine, but tensioners and guides can wear), while the 3.0L V6 uses a timing belt that requires replacement around 105,000 miles.
Brake Fluid Flush:
Every 2 years, regardless of mileage.
Engine Oil Type:
API SJ/SL or higher, ACEA A3/B4, specifically meeting VW 502 00 / 505 00 standards. Common viscosity grades: 5W-40 or 0W-40.
Coolant Type:
G12 or G12+ pink coolant (Ethylene Glycol based), mixed 50/50 with distilled water.
Transmission Fluid Type:
Manual: G 052 172 (or equivalent GL-4/GL-5); Automatic: G 055 025 (or equivalent ATF spec).
Power Steering Fluid:
Pentosin CHF 11S or equivalent hydraulic fluid.
Pcv System:
Clogged Positive Crankcase Ventilation (PCV) valve and hoses can lead to oil leaks, increased oil consumption, and rough idling, especially on 1.8T and 2.0T engines.
Ignition Coils:
Coil-on-plug ignition coils are prone to failure, causing misfires and rough running. Often requires replacement of all coils as a preventative measure.
Oil Leaks:
Leaking valve cover gaskets, oil pan gaskets, and oil filter housings are common due to age and material degradation.
HVAC Blower Motor:
Blower motor resistor failure can lead to the fan only working on the highest setting or not at all.
Timing Chain Tensioners:
Early 3.0L V6 engines (specifically pre-2005 B6) had issues with timing chain tensioners and guides, leading to rattling noises and potential catastrophic failure. The B7 and later 3.0 V6 revised this.
Oil Consumption Tfsi:
The early 2.0 TFSI (2.0T) engines could exhibit higher than normal oil consumption due to issues with piston rings and valve stem seals. Parts catalog is vital for replacement components.
