The 2007 BMW 335i, part of the E90/E92 generation, is known for its performance and luxury blend—especially with the twin-turbocharged N54 engine under the hood. While it delivers an engaging drive, this model is also infamous for several mechanical and electronic problems. Whether you’re a current owner or thinking about buying one, this guide breaks down the most common 2007 BMW 335i problems and how to deal with them.
Is the 2007 BMW 335i Reliable?
The 2007 335i can be a reliable performance vehicle if well-maintained, but it’s notorious for several critical issues—especially with the N54 engine and its supporting systems. These cars are often described as rewarding to drive but demanding to own.
Most Common 2007 BMW 335i Problems
1. High Pressure Fuel Pump (HPFP) Failure
One of the most widely known issues with the 335i is HPFP failure. This part pressurizes fuel for the direct injection system and tends to fail prematurely.
- Symptoms: Long crank time, engine hesitation, limp mode, fuel pressure fault codes
- Fix: Replace HPFP (revised versions have improved longevity)
- Cost: $900–$1,500 including labor
2. Turbo Wastegate Rattle and Failure
The stock N54 turbos often develop wastegate rattle or even complete turbo failure over time.
- Symptoms: Rattling sound on deceleration, loss of boost, underboost codes
- Fix: Replace turbochargers (some repair kits exist but aren’t permanent)
- Cost: $2,000–$3,500 for parts and labor
3. Fuel Injector Problems
Piezoelectric fuel injectors on the N54 engine are prone to leaking or clogging, leading to misfires and fuel dilution.
- Symptoms: Rough idle, misfires (especially cold start), fuel smell, rich running
- Fix: Replace faulty injectors (index 12 injectors are the updated version)
- Cost: $250–$400 per injector, often replaced in sets
4. Water Pump and Thermostat Failure
The electric water pump is another well-known failure point. When it dies, the engine overheats quickly.
- Symptoms: Overheating, fan running at full speed, warning lights
- Fix: Replace water pump and thermostat together
- Cost: $800–$1,200
5. Oil Filter Housing Gasket (OFHG) Leak
The oil filter housing gasket is a notorious leak point on the N54. If left unchecked, oil can reach the serpentine belt and cause serious damage.
- Symptoms: Visible oil leak at front driver side of engine, low oil warning
- Fix: Replace gasket and clean surrounding area
- Cost: $300–$600
6. Carbon Build-Up on Intake Valves
Direct injection engines like the N54 don’t clean the intake valves with fuel spray, which allows carbon deposits to form.
- Symptoms: Loss of power, poor throttle response, misfires, rough idle
- Fix: Walnut blasting of intake valves
- Cost: $400–$700
7. Valve Cover and Gasket Leaks
Both the valve cover and gasket are common failure points, especially after 80,000 miles.
- Symptoms: Oil smell, smoke from engine bay, oil on top of engine
- Fix: Replace gasket or entire valve cover if cracked
- Cost: $400–$800
8. Transmission Shifting Issues
The 6-speed automatic can develop rough shifting or slipping, especially if the fluid was never changed.
- Symptoms: Delayed engagement, harsh upshifts, transmission warning lights
- Fix: Transmission service or rebuild
- Cost: $300–$500 for fluid service; $3,000+ for rebuild
9. Ignition Coil and Spark Plug Failure
Coils and plugs degrade with age and turbo heat, often causing misfires under boost.
- Symptoms: Misfires, poor fuel economy, engine light
- Fix: Replace all coils and plugs (every 50–60k miles)
- Cost: $200–$400
10. Battery and IBS Sensor Problems
The Intelligent Battery Sensor (IBS) can shut down electrical systems or cause no-start conditions.
- Symptoms: Electrical glitches, random warning lights, hard starts
- Fix: Replace battery and IBS sensor, register new battery
- Cost: $250–$400
Known Recalls and Technical Service Bulletins
- HPFP extended warranty: BMW issued a 10-year/120,000-mile extended warranty on this part
- Turbocharger wastegate rattle: Covered under some warranty extensions (check VIN)
- Battery cable recall: Corrosion on positive cable connection in the trunk
Cost Summary for Common Repairs
| Problem | Estimated Repair Cost |
|---|---|
| HPFP replacement | $900–$1,500 |
| Turbo replacement (pair) | $2,000–$3,500 |
| Water pump & thermostat | $800–$1,200 |
| Walnut blasting intake | $400–$700 |
| Injector set (index 12) | $1,000–$1,500 |
| Oil filter housing gasket | $300–$600 |
Maintenance Tips for Preventing 335i Issues
- Change oil every 5,000 miles using high-quality synthetic oil
- Replace HPFP, injectors, and coils with updated parts
- Use premium fuel only
- Perform walnut blasting every 50,000–60,000 miles
- Scan regularly with a BMW diagnostic tool (ISTA or equivalent)
Final Thoughts
The 2007 BMW 335i is a true driver’s car—but one that demands attention. The N54 engine delivers impressive performance, yet it comes with a list of well-known issues, including fuel system faults, oil leaks, and carbon buildup. If you’re willing to stay on top of maintenance and repairs, the 335i can offer a thrilling driving experience. But skip the upkeep, and it can quickly turn into a money pit.
Own a 2007 335i? Use this guide to stay proactive with maintenance, address early warning signs, and make smart repair decisions to keep your BMW running strong.