BMW X4 2021
Analysis of 160 active listings for BMW X4 2021 from mobile.bg, cars.bg and other sources. Real market prices, known engine issues and what to check before buying.
Diesel 77Hybrid 43Petrol 37Other 4
📊 Market data
- Cheap listings30 990 €
- Typical price38 732 €
- Expensive listings48 900 €
- Average mileage93 068 км
⚙️ Engines — what to expect
BMW B-series diesel — B47
Known issues
- Like all modern diesels, DPF can clog if driven mostly short city trips. (~400–1 200 € repair)
- EGR cooler can develop internal leaks, causing coolant loss and white smoke. (~500–1 200 € repair)
- Piezo injectors can fail individually. Usually one at a time. (~250–500 € repair)
BMW B57 3.0 quad-turbo diesel — B57
Known issues
- EGR cooler can leak coolant into exhaust — white smoke. Can also contaminate oil. (~500–1 500 € repair)
- Complex exhaust aftertreatment — AdBlue injection can clog or fail. SCR catalyst expensive. (~400–2 000 € repair)
- B57D30S0 (quad-turbo) has 4 turbos — any failure is expensive and complex. Parts supply limited. (~2 000–6 000 € repair)
- Injectors can develop leak-back at higher mileage, causing hard starts. (~600–1 500 € repair)
- Turbo oil feed lines can coke with long oil intervals, accelerating turbo wear. (~400–1 200 € repair)
BMW N57 inline-6 diesel — N57
Known issues
- Intake swirl flaps can crack and get ingested into engine — catastrophic if it happens. Delete or replace with upgraded units. (~300–5 000 € repair)
- Bi-turbo N57S/N57D30T1 models — VTG actuator on small turbo can fail. Causes limp mode. (~500–1 500 € repair)
- City driving clogs the DPF, especially on short trips. Forced regeneration or replacement may be needed. (~500–1 200 € repair)
- EGR cooler can develop internal leak. Causes coolant loss and white smoke. (~500–1 200 € repair)
- Injectors can develop leak-back at higher mileage, causing hard starts. (~600–1 500 € repair)
🚨 What to check before buying
Overall risk score: 10/10
Additional notes
- BMW X5 diesel is the top luxury SUV in Bulgaria (1700+ listings). At 200k+ km: timing chain, DPF, turbo, swirl flaps, transfer case, and air suspension (if equipped) are all potential failure points.
- Diesel car from before 2018 with very low mileage suggests city-only use — DPF is likely clogged or has been removed (illegal). Check DPF status and EGR condition.
- BMW 730d (150+119 listings, avg 155-177k km, €35-37k) — flagship technology depreciates but repair costs don't. Air suspension (€2000+/corner), laser headlights (€3000+/unit), gesture control failures, ZF 8HP at high mileage. B57 engine is reliable but service intervals are expensive. Annual maintenance €3000-5000.
- BMW X6 diesel (199+154 listings, avg 148-176k km, €36-39k) — bought for image, expensive to maintain. Coupe-SUV body means unique (expensive) rear glass and body panels. N57/B57 3.0d is reliable but: transfer case service €1000+, adaptive dampers €2000+ per pair, 21-inch+ tires €1500+/set.
🔥 Current market offers
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