"Is the 3 Serisi 335d reliable, and what should you check?"
When buying a used BMW 3 Series 335d 2009 (E90 / E91 / E92 / E93 / facelift), the most frequently mentioned issue is: intake manifold, swirl flaps, and mass air flow sensor problems. Oil leaks (valve cover gaskets/seals) are also commonly reported.
Engine: M57
M57D30TU2 · turbo petrol · 335d · Used in this car from 2006-2013
Known engine issues
Swirl flapsThe first generation of this diesel was equipped with steel intake swirl flaps that could break off and fall into the cylinders, usually fatal for the engine. After modernization, plastic flaps appeared and they are relatively safe.
Fuel systemThe Bosch Common Rail system with electromagnetic injectors is very reliable and has a huge service life; it is important not to skimp on fuel quality and maintenance. At high mileage, leaks at the rail pressure regulator and failure of the high-pressure pump (sometimes just replacing its filter) occur periodically.
TurbochargerThe turbocharger itself is quite durable and rarely causes trouble; boost problems are usually related to cracks in vacuum hoses or a stuck pressure regulator. Note that the turbo can also leak oil if the crankcase ventilation is faulty.
+2 more issues on the engine detail page
Known issues and risks
Listed from most frequently reported, each with its source.
Intake manifold, swirl flaps, and mass air flow sensor problems
Often reported
The intake manifold and swirl flaps can wear, stick, or break, causing uneven distribution, abnormal noises, and torque loss. In some cases, broken flaps can damage the intake system and require manifold replacement. Additionally, faults or contamination in the mass air flow sensor can cause engine unresponsiveness, acceleration difficulty, and hesitant behavior at low revs. Temporary cleaning may provide short-term improvement.
Engine Bay
Oil leaks (valve cover gaskets/seals)
Often reported
Oil seepage and leaks from valve cover gaskets and other cylinder head points can contaminate electrical components or intake, and in extreme cases contribute to smoke or other faults.
Engine Internal
Timing chain/tensioner wear (rare but possible)
Often reported
In the N57 six-cylinder engine, although less common than in other BMW engines (e.g., N47), cases of chain and tensioner stretching or wear are reported. Symptoms include metallic noises when cold and rough running; if neglected, costly replacement may be needed.
Timing chain
DPF clogging
Often reported
On the 3.0 diesel N57 engine, the DPF can clog, especially with city or short-distance driving that prevents effective regeneration.
Exhaust Emissions
Carbon buildup and EGR valve
Often reported
Carbon buildup in the exhaust gas recirculation channels and EGR valve is frequently reported on the 3.0 diesel (N57 family, 258 HP version). Deposits cause rough running, check engine light, smoke, and poor response at low revs.
Exhaust Emissions
Injection system / high-pressure pump and injectors
Often reported
The N57 engine family has a complex fuel system; some units may experience injector or high-pressure pump component failures, causing hard starting, power loss, and warning light illumination.
Fuel System
Turbo/actuator failures
Often reported
Power loss, sudden power drops, and erratic behavior are reported, often associated with turbo or actuator issues.
Turbo
BMW 3 Serisi 335d technical specs
BMW 3 Serisi 335d (2009): boot 440 L; fuel use 6,6 l/100 km (urban 9 l/100 km · extra-urban 5,2 l/100 km); 0–100 in 5.9 s.
Boot capacity
440 L
Fuel consumption
6,6 l/100 km (urban 9 l/100 km · extra-urban 5,2 l/100 km)
What should I look for when buying a BMW 3 Series 335d?+
When buying a 2009 335d, check the service history, test drive, and look for engine/transmission warnings. Most commonly reported issues: intake manifold, swirl flaps, and mass air flow sensor problems; oil leaks (valve cover gaskets/seals); timing chain/tensioner wear (rare but possible).
What are the chronic problems of the BMW 3 Series 335d?+
Most commonly reported issues: intake manifold, swirl flaps, and mass air flow sensor problems; oil leaks (valve cover gaskets/seals); timing chain/tensioner wear (rare but possible).
Is the BMW 3 Series 335d reliable?+
Rather than a simple yes/no, it's best to weigh the proven pros and cons together. This page lists 7 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from Difetti fault database records; the source vehicle is verified for brand, fuel, engine, and generation match with the target vehicle. Topics with insufficient evidence are not shown.