The B47 is a remarkably robust engine if the EGR recall has been performed. Unlike its predecessor, it does not suffer from spontaneous timing chain snaps at low mileage. However, it is an 'interference engine', meaning a chain failure is catastrophic. The primary risk shifted from mechanical internals to emissions hardware. Beyond the EGR, the Diesel Particulate Filter (DPF) requires regular highway runs to prevent soot loading. Owners who primarily drive in urban environments should monitor reports on DPF life expectancy (via ADAC) to avoid expensive forced regenerations or replacements. Generally, a B47 with a documented service history every 15,000 km is one of the best modern diesels on the market.
BMW B47
BMW B47 Diesel Engine
Introduced in 2014 as the successor to the notorious N47, the B47 is a 2.0-liter, four-cylinder turbocharged diesel engine that forms the backbone of BMW’s European lineup. It features a modular design, part of the B-series family, sharing components with the B37 (3-cylinder) and B57 (6-cylinder) engines. The shift to a modular architecture allowed for better thermal management and improved refined. While it maintains the rear-mounted timing chain layout, the mechanical components were significantly beefed up to address previous reliability concerns. For a technical overview of the transition, technical sites like BMW Blog provide detailed engine comparisons.
This overview summarizes the reliability of the BMW B47, including common issues and cost drivers.
Technical Specifications
Manufacturer
BMW
Fuel Type
Diesel
Displacement
2.0 L
Production
2014–Present
Power Output
116 hp
Emissions
Euro 6, Euro 6d
Reliability Analysis
Recommended
Autoscore Verdict
Highly Recommended if the EGR cooler has been replaced under recall. Avoid cars with 30,000 km service intervals and no proof of EGR work. It is a smooth, efficient, and durable workhorse for long-distance commuters.
Risk Score
4.5
out of 10
Common Problems & Weak Points
| Issue | Typical Mileage | Repair Cost (Est.) | Severity |
|---|---|---|---|
| EGR Cooler Leakage & Recall | ~80,000 km | €0 – €1200 | High |
| Timing Chain Wear | ~200,000 km | €1500 – €2500 | High |
EGR Cooler Leakage & Recall
The B47's most significant vulnerability is the Exhaust Gas Recirculation (EGR) cooler. Over time, the cooler's internal structure can crack, leading to coolant leakage. When glycol-based coolant mixes with carbon soot deposits in the intake, it creates a flammable 'sludge' that can ignite under high temperatures. This has led to massive global recalls by BMW to replace the faulty units. If the car is outside of the recall window, a replacement is critical as it poses a genuine fire risk to the vehicle.
Typical Mileage: 80,000 km
Cost: €0–1200
Timing Chain Wear
The B47 moved the timing chain to the back of the engine, which improves weight distribution but makes access difficult. While the chain and guides were redesigned to fix the N47's catastrophic failure rate, they are not 'lifetime' parts. Prolonged 30,000 km oil intervals lead to soot accumulation in the oil, which acts as an abrasive on the chain pins. You can hear the 'marbles in a tin can' sound on cold starts if the chain is stretched. Detailed owner discussions on Bimmerpost regarding B47 longevity suggest that 10,000 - 12,000 km oil changes are mandatory to reach high mileage safely.
Typical Mileage: 200,000 km
Cost: €1500–2500
Buyer's Inspection Checklist
- Verify the EGR cooler recall status via the BMW VIN portal or official dealer records.
- Listen for rhythmic scraping or slapping sounds from the rear of the engine block during a cold start (indicates timing chain slack).
- Check the coolant level; a mysteriously low reservoir without external leaks often points to an internal EGR cooler crack.
- Inspect the service book for oil changes—reject cars that strictly followed the 30,000 km LongLife schedule if they have over 150,000 km.
Frequently Asked Questions
Is the B47 engine reliable?
The B47 has known weak points, but with good maintenance the reliability is solid. See the risk analysis and common problems for specifics. Start a report for a specific car.
How expensive are typical repairs?
Common repairs fall into a mid-range cost band depending on the issue and workshop. Check the cost ranges in the table. Use the used car report for specific listings.
Which model years are best for this engine?
Newer production years often include technical updates. Review the production years and revisions in the specs. Use Car Check for quick screening.