2004 Audi A4

Introduction

The 2004 Audi A4 is a compact luxury sedan that offers a sophisticated blend of performance, style, and comfort. It is powered by a choice of a 1.8-liter turbocharged four-cylinder engine with 170 horsepower and 166 lb-ft of torque, or a 3.0-liter V6 engine with 220 horsepower and 221 lb-ft of torque. Both engines are paired with a six-speed manual transmission or a five-speed automatic transmission. The A4 is praised for its sporty handling, refined interior, and impressive fuel economy. However, it has also been known to experience some specific issues.

Engine

• 1.8-liter Turbocharged Four-Cylinder Engine
  • Timing Belt Tensioner Failure:
    • Description/Symptoms: The timing belt tensioner may fail, causing the timing belt to slip or even break. This can result in catastrophic engine damage.
    • Solution: Replace the timing belt tensioner and timing belt.
    • Estimated Cost to Fix: $1,000 - $1,500+
    • Recalls: NHTSA Campaign Number 04V223000
  • Turbocharger Wastegate Solenoid Failure:
    • Description/Symptoms: The turbocharger wastegate solenoid may fail, causing the wastegate to malfunction. This can result in reduced engine performance or excessive turbocharger boost, potentially damaging the engine.
    • Solution: Replace the turbocharger wastegate solenoid.
    • Estimated Cost to Fix: $300 - $500+
• 3.0-liter V6 Engine
  • Valve Stem Seal Leakage:
    • Description/Symptoms: The valve stem seals may leak, causing excessive oil consumption and blue smoke from the exhaust.
    • Solution: Replace the valve stem seals.
    • Estimated Cost to Fix: $1,500 - $2,000+

Transmission

• Six-Speed Manual Transmission:
  • Clutch Master Cylinder Failure:
    • Description/Symptoms: The clutch master cylinder may fail, making it difficult to engage the clutch.
    • Solution: Replace the clutch master cylinder.
    • Estimated Cost to Fix: $300 - $500+
  • Transmission Mount Failure:
    • Description/Symptoms: The transmission mount may fail, causing excessive vibration and noise during gear changes.
    • Solution: Replace the transmission mount.
    • Estimated Cost to Fix: $200 - $300+
• Five-Speed Automatic Transmission:
  • Torque Converter Lockup Clutch Failure:
    • Description/Symptoms: The torque converter lockup clutch may fail, causing shuddering or slipping during acceleration.
    • Solution: Replace the torque converter lockup clutch.
    • Estimated Cost to Fix: $1,000 - $1,500+
  • Control Module Failure:
    • Description/Symptoms: The transmission control module may fail, resulting in erratic shifting or transmission operation.
    • Solution: Replace the transmission control module.
    • Estimated Cost to Fix: $500 - $800+

Suspension

• Strut and Shock Absorber Wear:
  • Description/Symptoms: The struts and shock absorbers may wear out over time, leading to reduced ride comfort and handling.
  • Solution: Replace the struts and/or shock absorbers.
  • Estimated Cost to Fix: $500 - $1,000+

Electrical

• Alternator Failure:
  • Description/Symptoms: The alternator may fail, leading to a loss of electrical power and potential battery drain.
  • Solution: Replace the alternator.
  • Estimated Cost to Fix: $300 - $600+
• Battery Drain:
  • Description/Symptoms: The battery may drain prematurely due to a parasitic draw.
  • Solution: Diagnose and repair the source of the parasitic draw.
  • Estimated Cost to Fix: Varies depending on the source of the draw

Exterior

• Headlamp Condensation:
  • Description/Symptoms: The headlamps may develop condensation inside the lenses, reducing visibility.
  • Solution: Replace the headlamp assemblies.
  • Estimated Cost to Fix: $500 - $1,000+

Interior

• Dashboard Rattling:
  • Description/Symptoms: The dashboard may rattle or creak due to loose panels or clips.
  • Solution: Tighten or replace the loose panels or clips.
  • Estimated Cost to Fix: $100 - $200+
• Heater Core Leak:
  • Description/Symptoms: The heater core may leak, causing coolant to enter the passenger compartment and produce an odor.
  • Solution: Replace the heater core.
  • Estimated Cost to Fix: $500 - $800+

Summary

While the 2004 Audi A4 is generally a reliable vehicle, it has been known to experience some specific issues. The most severe issues include timing belt tensioner failure, valve stem seal leakage, and transmission control module failure. These problems can be costly to repair, but many can be prevented with proper maintenance and care. Overall, the A4 remains a popular choice due to its sporty performance, elegant style, and comfortable interior.