2007 BMW Z4

2007 BMW Z4

Overview

The 2007 BMW Z4, a sporty two-seater convertible, offered a compelling blend of performance and style. It was available with a range of potent inline-six engines, known for their smooth power delivery and engaging driving dynamics. While generally well-regarded for its driving experience, like any vehicle of its age, certain components can experience issues. This analysis focuses on documented, non-wear-and-tear related reliability concerns across key systems, providing insights for potential owners or those performing maintenance on this enthusiast-focused roadster.

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Engine

3.0L I6 (N52B30)

Valve Cover Gasket Leak

• Symptoms: Oil smell in the engine bay, visible oil on the engine block, potential for oil to drip onto exhaust components.
• Solution: Replacement of the valve cover gasket.
• Cost: $300 - $600

Oil Pan Gasket Leak

• Symptoms: Oil spots under the vehicle, low oil level warnings, visible oil seepage around the bottom of the engine.
• Solution: Replacement of the oil pan gasket.
• Cost: $400 - $700

Cooling System Leaks (Water Pump/Thermostat)

• Symptoms: Overheating, coolant leaks under the car, heater not working effectively, ‘check engine’ light.
• Solution: Replacement of the water pump and/or thermostat housing.
• Cost: $500 - $900

2.5L I6 (N52B25)

Valve Cover Gasket Leak

• Symptoms: Oil smell in the engine bay, visible oil on the engine block, potential for oil to drip onto exhaust components.
• Solution: Replacement of the valve cover gasket.
• Cost: $300 - $600

Oil Pan Gasket Leak

• Symptoms: Oil spots under the vehicle, low oil level warnings, visible oil seepage around the bottom of the engine.
• Solution: Replacement of the oil pan gasket.
• Cost: $400 - $700

Cooling System Leaks (Water Pump/Thermostat)

• Symptoms: Overheating, coolant leaks under the car, heater not working effectively, ‘check engine’ light.
• Solution: Replacement of the water pump and/or thermostat housing.
• Cost: $500 - $900

Transmission

6-Speed Manual

Clutch Wear

• Symptoms: Slipping clutch, difficulty shifting gears, burning smell, shuddering on engagement.
• Solution: Clutch replacement (clutch kit including pressure plate, disc, and release bearing).
• Cost: $800 - $1500

6-Speed Automatic (Steptronic)

Transmission Fluid Leaks

• Symptoms: Leaking fluid from transmission seals or cooler lines, rough shifting, slipping gears, warning lights.
• Solution: Repair or replacement of leaking seals, lines, or transmission cooler.
• Cost: $400 - $1200

Solenoid Issues

• Symptoms: Harsh shifting, delayed engagement, transmission fault codes.
• Solution: Replacement of faulty transmission solenoids.
• Cost: $500 - $1000

Suspension

Standard Chassis

Control Arm Bushing Wear

• Symptoms: Clunking noises over bumps, vague steering feel, uneven tire wear.
• Solution: Replacement of worn control arm bushings or the entire control arm assembly.
• Cost: $400 - $800

Strut Mount Bearing Failure

• Symptoms: Popping or creaking noise when turning the steering wheel, especially at low speeds.
• Solution: Replacement of the strut mount bearings.
• Cost: $300 - $600

Electrical

General Electrical System

Window Regulator Failure

• Symptoms: Power windows not operating, slow window movement, grinding noise when operating windows.
• Solution: Replacement of the window regulator mechanism.
• Cost: $300 - $500

Headlight Bulb Failure (Xenon)

• Symptoms: One or both Xenon headlights not illuminating, flickering headlights.
• Solution: Replacement of Xenon bulbs and potentially ignitors.
• Cost: $200 - $500

Exterior

Convertible Top Mechanism

Hydraulic Leaks/Pump Failure

• Symptoms: Convertible top not operating, slow operation, fluid leaks around the top mechanism.
• Solution: Repair or replacement of hydraulic lines, cylinders, or the hydraulic pump.
• Cost: $800 - $2000

Top Sensor Malfunction

• Symptoms: Top not closing fully, dashboard warning lights related to the convertible top.
• Solution: Diagnosis and replacement of faulty top sensors.
• Cost: $200 - $400

Interior

HVAC System

Blower Motor Resistor Failure

• Symptoms: HVAC fan only works on the highest setting, or not at all.
• Solution: Replacement of the blower motor resistor.
• Cost: $150 - $300

Infotainment System (CCC/iDrive)

Navigation System Glitches

• Symptoms: Navigation screen freezing, incorrect map display, system reboots.
• Solution: Software update or repair/replacement of the head unit.
• Cost: $300 - $1000

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Summary Verdict

The 2007 BMW Z4, particularly with its inline-six engines, is generally a reliable sports car, but potential buyers should be aware of common issues. Engine oil leaks from the valve cover and oil pan gaskets are relatively frequent and manageable. Cooling system components like the water pump and thermostat can also require attention. For transmissions, manual clutches will eventually need replacement, and automatics may develop leaks or solenoid issues. Suspension components like control arm bushings and strut mounts are known to wear. Electrical gremlins can include window regulators and Xenon headlight components. The convertible top mechanism, while a highlight, can be a source of costly repairs if hydraulic systems fail. Overall, with diligent maintenance and addressing these specific potential issues, the Z4 can remain a rewarding vehicle.