2007 BMW 335i

2007 BMW 335i

Overview

The 2007 BMW 335i, powered by the potent N54 twin-turbocharged inline-six engine, offers exhilarating performance. However, this performance comes with a reputation for specific, albeit often addressable, reliability concerns. While the chassis and general build quality are typical of BMW’s premium offerings, the advanced engine technology, particularly the fuel delivery and turbocharger systems, are prone to issues that can be costly to repair. Transmission options, while generally robust, also have documented failure points. Owners should be aware of these potential pitfalls, as proactive maintenance and timely repairs are crucial for maintaining this performance luxury sedan.

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Engine

3.0L Twin-Turbocharged Inline-6 (N54)

High-Pressure Fuel Pump (HPFP) Failure

• Symptoms: Stalling, rough idle, difficulty starting, check engine light.
• Solution: Replacement of the HPFP.
• Cost: $800 - $1500

Turbocharger Wastegate Rattle/Failure

• Symptoms: Rattling noise from the engine bay, especially on startup or deceleration; loss of boost.
• Solution: Replacement of turbochargers or wastegate actuators.
• Cost: $2000 - $4000+

Fuel Injector Failure

• Symptoms: Rough idle, misfires, poor performance, check engine light.
• Solution: Replacement of faulty fuel injectors.
• Cost: $300 - $600 per injector

PCV Valve Failure

• Symptoms: Oil leaks, rough idle, increased oil consumption, blue smoke from exhaust.
• Solution: Replacement of the crankcase ventilation valve assembly.
• Cost: $400 - $700

Transmission

6-Speed Automatic (GM GA6HP19Z)

Mechatronic Unit Failure

• Symptoms: Harsh shifting, slipping gears, transmission warning light, inability to select gears.
• Solution: Repair or replacement of the mechatronic unit.
• Cost: $1500 - $3000

Torque Converter Issues

• Symptoms: Shuddering at low speeds, slipping, delayed engagement.
• Solution: Replacement of the torque converter.
• Cost: $1000 - $2000

6-Speed Manual

Clutch Wear

• Symptoms: Slipping clutch, difficulty shifting, burning smell.
• Solution: Clutch kit replacement (clutch disc, pressure plate, release bearing).
• Cost: $1000 - $1800

Suspension

Standard Chassis

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: No widespread issues reported.

Electrical

General Electrical System

Water Pump Failure (Electric)

• Symptoms: Overheating, coolant leaks, check engine light.
• Solution: Replacement of the electric water pump and thermostat.
• Cost: $700 - $1200

Idrive System Glitches

• Symptoms: Screen freezing, unresponsiveness, navigation issues.
• Solution: Software updates or replacement of iDrive controller/head unit.
• Cost: $300 - $1000+

Exterior

Body and Trim

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: No widespread issues reported.

Interior

Cabin Components

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: No widespread issues reported.

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Summary Verdict

The 2007 BMW 335i is a performance-oriented vehicle with a known set of potential reliability concerns, primarily centered around its advanced N54 engine. Issues with the high-pressure fuel pump, twin-turbochargers, and fuel injectors are common and can be expensive to rectify. The automatic transmission can also experience mechatronic unit failures. While the chassis, suspension, and interior are generally well-built, owners must budget for potential repairs related to the powertrain. Regular and thorough maintenance, especially concerning the fuel system and cooling, is paramount for mitigating these risks and ensuring the longevity of this sporty BMW.