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2003 Audi A4 parts

Common replacement parts for the 2003 Audi A4, what usually wears out, a general maintenance schedule, and where to shop. Parts can differ by engine, trim and build date, so confirm fitment with your VIN before you buy.

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Popular parts

Brakes

Ignition & Starting

Electrical & Charging

Cooling

Belts & Pulleys

Serpentine Belt

Engine

Fuel System

Air Intake & Turbo

Maintenance

Exhaust & Emissions

Catalytic Converter

Sensors & Modules

Steering

Outer Tie Rod End

Suspension

Drivetrain & Axles

CV Axle Shaft

Heating & A/C

Lighting

Body & Exterior

Wiper Blades

General maintenance schedule

These are common starting intervals, not a factory schedule for your engine. Your owner's manual always wins.

Engine oil & filter	Every 5,000 miles or 6 months Use the oil grade and spec in your owner's manual. Some engines allow longer.
Tire rotation	Every 7,500 miles or 6 months Also a good time to check tread depth and pressures.
Brake inspection	Every 12,000 miles or 1 year Pads, rotors, lines and fluid level.
Cabin air filter	Every 15,000 miles or 1 year Sooner if the airflow smells musty or feels weak.
Engine air filter	Every 20,000 miles or 2 years Sooner on dusty or gravel roads.
Wiper blades	Every 1 year
12V battery test	Every 3 years Most 12V batteries last 3 to 5 years. Test before winter.
12V battery replaced	Every 5 years Most last 3 to 5 years. Heat and short trips wear them faster.
Tires (replace)	Every 50,000 miles or 6 years Tread depth and age matter more than miles. Replace at 2/32" of tread (4/32" if you drive in the rain a lot), or around 6 years old. The date code is on the sidewall.
Brake pads (replace)	Every 40,000 miles Replace when about 3 mm (1/8 in) of pad is left, or if you hear grinding. Rear pads usually last longer than front.
Brake rotors (replace)	Every 70,000 miles Replace below the minimum thickness stamped on the rotor, or if warped or deeply grooved. Often done with new pads.
Shocks & struts (replace)	Every 75,000 miles Worn ones cause bouncing, nose-dive when braking and uneven tire wear. Many last 50,000 to 100,000 miles.
Brake fluid flush	Every 30,000 miles or 2 years Brake fluid absorbs moisture over time.
Spark plugs	Every 60,000 miles Iridium or platinum plugs often go 100,000 miles. Check the manual.
Transmission fluid	Every 60,000 miles Interval varies a lot by transmission. Check the manual.
Coolant flush	Every 60,000 miles or 5 years Some long-life coolants go 100,000+ miles.
Serpentine belt	Every 90,000 miles Inspect for cracks at every oil change.
Timing belt (if equipped)	Every 90,000 miles or 7 years Skip if your engine has a timing chain. Check the manual.

Safety recalls

NHTSA lists 4 recalls for the 2003 Audi A4. Recalls apply by model year, and not every vehicle of that year is affected. Check your own VIN at nhtsa.gov/recalls.

ENGINE AND ENGINE COOLING:ENGINE (14E007000): The Gates Corporation (Gates) is recalling certain aftermarket Tru-Flow Water Pumps, part number TFW 41127, sold at certain NAPA Auto Parts and/or installed by automotive service technicians after November 1, 2013 (an…
EXTERIOR LIGHTING:HEADLIGHTS (05V096000): ON CERTAIN PASSENGER VEHICLES, THERE IS A POSSIBILITY OF XENON HEADLAMP COATING DEGRADATION OVER TIME. THE LUMINOUS TRANSMITTANCE OF THE HEADLAMP MAY DECREASE OVER A PERIOD OF TIME.
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP (07V375000): ON CERTAIN VEHICLES EQUIPPED WITH 1.8L TURBO, 2.8L V6, OR 3.0L ENGINES, A CHANGE IN THE ELECTRICAL MOTOR COMPONENTS IN THE FUEL PUMP CAN LEAD TO AN INOPERATIVE FUEL PUMP AND, ULTIMATELY, STOPPAGE OF FUEL SUPPLY TO THE…
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP (06V017000): ON CERTAIN VEHICLES PRODUCED FROM SEPTEMBER 2002 - MARCH 2003, EQUIPPED WITH 1.8L TURBO, 2.8L V6, OR 3.0L ENGINES, A CHANGE IN THE ELECTRICAL MOTOR COMPONENTS IN THE FUEL PUMP CAN LEAD TO AN INOPERATIVE FUEL PUMP AND,…

Other Audi A4 years

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