Introduction
The BMW B47 is a 2.0-liter turbocharged inline-four diesel engine introduced in 2014 as the successor to the N47. It powers various BMW models including the 3 Series, 5 Series, X3, and 1 Series, offering a balance of performance and efficiency with outputs ranging from 116 to 231 horsepower.
Technical Specifications
- Displacement: 1995 cc
- Configuration: Inline-4 turbo diesel
- Power Output: 116-231 hp
- Torque: 270-500 Nm
- Fuel System: Common-rail direct injection
- Timing Drive: Chain-driven (front-mounted)
Reliability Overview
The B47 is generally more reliable than its predecessor, the N47, thanks to revisions like the relocated timing chain and improved EGR system. However, it can still experience issues related to the EGR cooler, swirl flaps, and turbocharger if not properly maintained. With regular servicing, many examples exceed 200,000 miles.
Common Problems & Failures
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EGR cooler failure leading to coolant leaks and overheating.
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Swirl flap breakage causing intake manifold damage.
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Turbocharger wear resulting in loss of boost and oil consumption.
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DPF clogging in short-trip driving conditions.
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Fuel injector failures after high mileage.
Repair Costs & Difficulty
EGR cooler replacement typically costs 800-1500 EUR including labor. Turbo repairs range from 1200-2500 EUR. These jobs are moderately difficult and best left to specialists familiar with BMW diesels due to tight engine bay access.
Maintenance Tips
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Change oil every 8,000-10,000 miles using BMW LL-04 spec oil.
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Regularly inspect and clean the EGR valve and cooler.
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Use quality diesel fuel and consider additives for DPF health.
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Monitor for warning lights related to emissions systems.
Verdict / Final Thoughts
The BMW B47 offers strong reliability when maintained properly and is a solid choice for diesel enthusiasts. Address issues early to avoid costly cascading failures, and always consult a BMW specialist for diagnostics.
