BMW B47 engine report
BMW B47 · 320d (F30)
2.0 LDieselInline-42015–2018
75/100
[good]
Strong diesel, chain and DPF permitting
Worth buying if the service history checks out.
ExcellentGoodSolidRiskyAvoid
- Known issues
- 8
- Critical
- 1
- Sources
- 34
Verdict
Two complaints dominate this engine: chain stretch, and a DPF that clogs.
A full service history matters for both, and stretched oil-change intervals are the warning sign to look for. The ZF 8HP automatic and the turbocharger fail less often but hit harder when they do, which is what makes a long test drive and a fault-code scan something to insist on. Clutch and dual-mass flywheel wear, EGR and swirl flap coking, thermostat faults and intercooler leaks fill out the rest, none of them surprising at the mileage these cars are on now.
Specs
- Displacement
- 2.0 L1,995 cc
- Layout
- Inline-4
- Fuel
- Diesel
- Compression
- 16.5:1
- Production
- 2014–present
- Chassis
- F30
- Generation
- F30 LCI
- Fitted
- 2015–2018
Known issues
8 confirmed · sorted by severity
CriticalEGR cooler leak (fire risk)
The EGR cooler cracks internally and leaks coolant into the exhaust-gas path. Glycol deposits build up in the intake manifold and can ignite. BMW recalled many of its diesels for this in 2018, so check whether the recall work has been done.
Symptoms
- Coolant Loss
- Burning Smell
- Smoke (White/Blue/Black)
- Warning Light
- Reduced Power Mode
How often
Common · Manufacturing defect. Can destroy the engine if ignored. Not safely drivable.
Evidence
3 owner reports back this, confidence 95/100.
HighTurbocharger failure
Turbo bearing/shaft wear, oil seal failure, or surge damage, often linked to oil starvation or carbon buildup.
Symptoms
- Power Loss
- Smoke (White/Blue/Black)
- Whining Noise
How often
Occasional · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
4 owner reports back this, confidence 40/100.
ModerateTiming chain stretch / guide wear
Timing chain elongates or plastic guides wear prematurely, causing rattle, incorrect valve timing, or in severe cases chain failure.
Symptoms
- Knocking Noise
- Cold Start Rattle
- Warning Light
How often
Common · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
6 owner reports back this, confidence 45/100.
ModerateDPF clogging / regeneration failure
Diesel particulate filter clogs, especially with short/urban trips that prevent regeneration, triggering warning lights or limp mode.
Symptoms
- Warning Light
- Reduced Power Mode
How often
Common · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
8 owner reports back this, confidence 45/100.
ModerateDual-mass flywheel / clutch wear
Dual-mass flywheel wear causing rattle/vibration, often coinciding with clutch replacement interval.
Symptoms
- Excessive Vibration
- Knocking Noise
How often
Occasional · Expected maintenance. Does not normally destroy the engine. Still drivable.
Evidence
6 owner reports back this, confidence 40/100.
LowEGR valve / swirl flap clogging
EGR valve, EGR cooler, or intake swirl flaps clog with carbon/soot, causing rough running or limp mode.
Symptoms
- Rough Idle
- Reduced Power Mode
- Warning Light
How often
Occasional · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
5 owner reports back this, confidence 45/100.
LowThermostat / temperature sensor failure
Thermostat sticking open or closed, or temperature sensor drift, causing incorrect operating temperature.
Symptoms
- Warning Light
How often
Occasional · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
10 owner reports back this, confidence 40/100.
LowIntercooler failure or leak
Intercooler core cracking or pipe seal failure, causing boost loss.
Symptoms
- Power Loss
How often
Rare · Age-related wear. Does not normally destroy the engine. Still drivable.
Evidence
2 owner reports back this, confidence 40/100.
- Critical
- High
- Moderate
- Low
EGR cooler leak (fire risk)from 80k km
Turbocharger failurefrom 80k km
Timing chain stretch / guide wearfrom 95k km
DPF clogging / regeneration failurefrom 285k km
Dual-mass flywheel / clutch wearfrom 72k km
EGR valve / swirl flap cloggingfrom 285k km
Thermostat / temperature sensor failurefrom 97k km
Intercooler failure or leakfrom 80k km
Buying checklist
0 of 7 checked
Sources
Updated 12 Sept 2026 · scoring v2.7
This report combines 34 owner posts, forum threads and official records. An issue only makes the list once the evidence is strong enough, an official recall on its own or several independent owner reports, and the score weighs how often each problem happens against how bad it is when it does.