"Is the 3 Serisi 325d reliable, and what should you check?"
When buying a used BMW 3 Series 325d 2009 (E90/E91/E92/E93 facelift), the most commonly mentioned issue is EGR valve/EGR cooler problems. Also, injector/common rail wear and (rare) timing chain issues are frequently reported.
Engine: M57
M57D30TU2 · turbo petrol · 325d · Used in this car from 2006-2009
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.
EGR valve/EGR cooler problems
Often reported
On the Series 3's B47 2.0 diesel engine, recurring failures of the EGR valve or EGR cooler are reported; can cause power loss, uneven throttle response, and the check engine light to come on.
Exhaust Emissions
Injector/common rail wear and (rare) timing chain issues
Often reported
Reports on 2.0 units indicate issues with injectors or common rail system at high mileage or with poor fuel maintenance, manifesting as power loss, smoke, and rough running; timing chain issues have also been seen (rarely) in the BMW diesel family.
Fuel System
Turbo problems (actuator/wastegate) and oil leaks
Often reported
Some reports on the G20 3 Series mention abnormal turbo noises (e.g., wastegate/actuator rattle), boost loss, and in worse cases, oil leaks from the turbo area resulting in blue/black smoke or performance drop.
Turbo
BMW 3 Serisi 325d technical specs
BMW 3 Serisi 325d (2009): boot 440 L; fuel use 4,9 l/100 km (urban 7,8 l/100 km · extra-urban 4,5 l/100 km); 0–100 in 7.3 s.
Boot capacity
440 L
Fuel consumption
4,9 l/100 km (urban 7,8 l/100 km · extra-urban 4,5 l/100 km)
What to look for when buying a BMW 3 Series 325d?+
When buying a 2009 325d, check service history, test drive, and look for engine/transmission warnings. Most commonly reported issues: EGR valve/EGR cooler problems; injector/common rail wear and (rare) timing chain issues; Turbo problems (actuator/wastegate) and oil leaks.
What are the chronic problems of BMW 3 Series 325d?+
Most commonly reported issues: EGR valve/EGR cooler problems; injector/common rail wear and (rare) timing chain issues; Turbo problems (actuator/wastegate) and oil leaks.
Is the BMW 3 Series 325d reliable?+
Rather than a simple yes/no, it's better to weigh the proven pros and cons together. This page lists 3 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from Difetti fault database records; brand, fuel, engine, and generation compatibility between source and target vehicle is verified. Topics with insufficient evidence are not shown.