2003 BMW Z4

Introduction

The 2003 BMW Z4 is a compact roadster known for its agile handling, powerful engine, and sleek design. It was available with two engine and transmission options:

• 2.5i: 2.5L inline-6, 184 hp and 175 lb-ft, available with a 5-speed manual or 5-speed automatic transmission
• 3.0i: 3.0L inline-6, 225 hp and 214 lb-ft, available with a 6-speed manual or 5-speed automatic transmission

Owners appreciate the Z4’s performance and handling, while some criticize its cramped interior and limited trunk space.

Engine

2.5i

• Intake camshaft sensor failure
  • Description/Symptoms: The intake camshaft sensor fails, causing the engine to run rough or stall.
  • Solution: Replace the intake camshaft sensor.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found
• Oil filter housing gasket leak
  • Description/Symptoms: The gasket between the oil filter housing and the engine block leaks oil.
  • Solution: Replace the oil filter housing gasket.
  • Estimated Cost to Fix: $150 - $250+
  • Recalls: None Found

3.0i

• Valve cover gasket leak
  • Description/Symptoms: The gasket between the valve cover and the cylinder head leaks oil.
  • Solution: Replace the valve cover gasket.
  • Estimated Cost to Fix: $300 - $500+
  • Recalls: None Found

Transmission

5-Speed Manual

• Synchronizer wear
  • Description/Symptoms: The synchronizers in the transmission wear out, making it difficult or impossible to shift gears.
  • Solution: Rebuild or replace the transmission.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found

5-Speed Automatic

• Transmission control unit (TCU) failure
  • Description/Symptoms: The TCU fails, causing the transmission to shift erratically or not shift at all.
  • Solution: Replace the TCU.
  • Estimated Cost to Fix: $1,000 - $2,000+
  • Recalls: None Found

6-Speed Manual

• Shift linkage bushing wear
  • Description/Symptoms: The bushings in the shift linkage wear out, causing the gear lever to feel loose or sloppy.
  • Solution: Replace the shift linkage bushings.
  • Estimated Cost to Fix: $100 - $200+
  • Recalls: None Found

Suspension

• Front control arm bushings worn
  • Description/Symptoms: The bushings in the front control arms wear out, causing the suspension to feel loose or unstable.
  • Solution: Replace the control arm bushings.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

Electrical

• Battery drain
  • Description/Symptoms: The battery drains quickly, even when the vehicle is not in use.
  • Solution: Find and repair the electrical drain, such as a malfunctioning light or faulty module.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found
• Alternator failure
  • Description/Symptoms: The alternator fails, preventing the battery from charging.
  • Solution: Replace the alternator.
  • Estimated Cost to Fix: $500 - $700+
  • Recalls: None Found

Exterior

• Convertible top leaks
  • Description/Symptoms: The convertible top leaks water into the cabin.
  • Solution: Replace the convertible top seals or reattach the top properly.
  • Estimated Cost to Fix: $500 - $1,000+
  • Recalls: None Found

Interior

• Door lock actuators fail
  • Description/Symptoms: The door lock actuators fail, preventing the doors from locking or unlocking.
  • Solution: Replace the door lock actuators.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

Summary

The 2003 BMW Z4 is a reliable and enjoyable vehicle overall. However, it is not without its issues. Engine and transmission problems are relatively minor and affordable to fix. Suspension and electrical issues are also manageable. The convertible top leak and door lock actuator failures are the most significant and expensive issues to watch out for.