BMW 320d B47

The BMW 320d B47 has a reliability score of 50/100, rated "RISKY". EGR fire risk shadows a capable diesel

The most frequently reported issues are EGR Cooler Coolant Leak, Fire Risk, Timing Chain Tension and Guide Wear, Vibration Damper / Crankshaft Pulley Failure, Oil Leaks, Valve Cover Gasket and Filter Housing Gasket, among others. See the Known Issues section above for symptoms, affected mileage, and repair costs.

Yes, this is a documented issue on the B47, typically appearing around 60,000-150,000 km. The EGR cooler can develop an internal coolant leak. Coolant mixes with soot and sediment and, at high exhaust temperatures, can ignite. BMW's EGR fire-risk recall history explicitly names N47, N57, and B47 diesels. Campaigns started in 2018 (323,700 vehicles), with expansions in 2019, 2020, and 2024. In the US, NHTSA 18V-755 and 21V-907 cover these engines. Even replacement coolers have been reported to leak again in some cases. Severe cases result in the intake manifold melting and causing an engine bay fire. Typical repair cost: €800-2,500. DIY difficulty: Hard.

Yes, this is a documented issue on the B47, typically appearing around 80,000-160,000 km. The B47 shares its timing chain architecture with the final revision of the N47. Outright chain failures are rarer on the B47 than on the early N47 engines, but wear, slack, and snapped chains still occur at higher mileages. The timing chain on longitudinal B47 installations (like the F30) is located at the rear of the engine block (flywheel side), making replacement a labor-intensive, engine-out job. Typical repair cost: €900-2,200. DIY difficulty: Expert only, requires engine removal.

Yes, this is a documented issue on the B47, typically appearing around 100,000-200,000 km. The rubber insert inside the crankshaft pulley (vibration damper) degrades, hardens, and eventually cracks over time. If it fails completely, it will throw the auxiliary drive belt, leading to a loss of power steering (if hydraulic), alternator charging, and air conditioning. Typical repair cost: €300-600. DIY difficulty: Moderate.

Yes, this is a documented issue on the B47, typically appearing around 80,000-180,000 km. Oil leaks from the valve cover gasket and oil filter housing gasket are a recurring theme. Burning oil smell is a common first symptom. These are wear items but should be addressed promptly to avoid oil reaching hot exhaust components. Typical repair cost: €150-600. DIY difficulty: Moderate.

Yes, this is a documented issue on the B47, typically appearing around 80,000-150,000 km. EGR valve and intake manifold carbon fouling is a known issue. The buildup can also affect the swirl flaps in the intake manifold, causing them to stick or throw actuator fault codes. This is exacerbated on cars used mainly for short trips. Typical repair cost: €200-700. DIY difficulty: Moderate.

The BMW B47 is a meaningfully better and more refined engine than the N47 it replaced, but it carries a serious, well-documented EGR cooler fire risk that has required multiple recall extensions through 2024. Always verify recall completion and check for signs of a re-leak or melted intake manifold before any purchase. Timing chain health remains a sensible second check: failures are rarer than in the N47 era, but the chain is still mounted at the rear of the engine block, meaning replacement requires dropping the transmission or removing the engine entirely. Budget for proactive maintenance on gaskets and the crankshaft pulley. With verified recall work and short oil intervals, this engine generally delivers strong performance and economy, but buying one without checking the EGR recall status is a real gamble given the fire risk involved.

The 2.0-litre B47 block powers the 316d, 318d, 320d, and 325d in the F30 LCI generation. Because they all share the same block, rear-mounted timing chain, and the heavily recalled EGR cooler system, reliability is dictated almost entirely by maintenance history and recall completion rather than power output. The 320d represents the best overall balance of performance and economy for most buyers. The twin-turbo 325d offers stronger performance but introduces a more complex, harder-to-service turbo setup. Regardless of which variant you choose, verifying EGR recall completion and documented short oil change intervals matters far more than the horsepower figure on the badge.

Before buying, check: Run the VIN through BMW's recall database and confirm EGR cooler recall has been completed; do not buy if outstanding, and be wary even if marked completed given reports of repeat leaks; Cold-start the engine and listen carefully for timing chain rattle or metallic chatter that fades once warm; Connect an OBD diagnostic tool and run BMW's timing chain tension test; check for any EGR or swirl flap fault codes; Inspect the EGR cooler area and intake manifold for coolant residue, soot staining, or melted plastic; Check valve cover and oil filter housing for oil seepage and evidence of burning oil smell in the engine bay.

There's no fixed mileage limit, it depends on maintenance. The parts worth budgeting for proactively are: EGR Cooler (Check at purchase, re-inspect every 30,000 km), Timing Chain Tensioner and Guides (100,000 km), Crankshaft Pulley (Vibration Damper) (100,000-150,000 km), Valve Cover Gasket (100,000-120,000 km). Engines that clear these checkpoints with documented maintenance commonly continue well beyond typical ownership periods.

Internal coolant leak within the EGR cooler can cause coolant to mix with soot and ignite at high temperatures, melting the intake manifold and creating a fire risk. Remedy: Inspection and replacement of EGR cooler, intake manifold, and associated components. Verify recall completion via VIN before purchase.

Estimated ownership cost is €1,200-3,500 over 3 years depending on EGR, timing, and seal condition at purchase, based on known issues and typical service needs.

Owners report real-world fuel consumption of around 5.4 L/100km, compared to the official figure of 4.59 L/100km.

Community-reported real-world usage suggests changing oil every 10,000 km using BMW Longlife-04 5W-30 (e.g. Castrol Edge 5W-30 LL or Shell Helix Ultra 5W-30), often more conservative than the official service schedule.

The B47 is also found in: BMW 118d / 120d F20 LCI, BMW 218d / 220d F45/F46, BMW 520d G30, BMW X1 xDrive20d F48, BMW X3 xDrive20d F25/G01, MINI Cooper SD F55/F56, BMW 420d F32 LCI.

EGR fire risk shadows a capable diesel The biggest recurring complaint is EGR Cooler Coolant Leak, Fire Risk. Mixed to cautious. Forum users generally view the B47 as more refined and less chain-prone than the N47, but the EGR fire recall dominates discussions and has eroded trust. Some owners report the EGR cooler has been replaced more than once under successive recall campaigns. Timing chain anxiety persists due to the engine-out replacement requirement, even though documented B47 chain failures appear considerably rarer than on the N47. Owners who complete recall work and maintain short oil intervals generally report solid reliability.