318i / 320i / 330i (B48 2.0 turbo)
2019–2024 · petrol · 1998cc · 258hp
Engine codes: B48, B46
Reliability, common problems and owner reviews for the Bmw 3 Series G20 318i / 320i / 330i (B48 2.0 turbo). Check this before you buy used.
The 2.0 turbo petrols (B48, often with 48V mild-hybrid — shared across the 4/5-Series and X3) are strong, refined and among BMW's more robust modern fours: front-located timing chain (not the failure-prone N47 diesel rear), smooth and punchy. Cautions are the modern direct-injection norm: intake-valve carbon over time, VANOS/PCV and turbo-coolant attention, and the excellent ZF 8-speed auto (very robust — just service it). A documented car with a healthy chain is dependable and quick. The 330i is the sweet spot. Buy on oil and service history.
Same engine, other cars
This is the same physical engine (B48) sold under different names across brands. Reliability is broadly shared — cross-check these:
- BMW 1 Series E87— 116i / 118i / 120i (N46, 2004–2007)150hp
- BMW X3 G01— xDrive20i / 30i (B48 2.0 turbo)252hp
- BMW X1— 18i / 20i / 28i (N46 / N20 petrol)184hp
- BMW 3 Series F30— 320i / 328i (N20 turbo)245hp
- BMW X3— xDrive20i / 28i (N20 turbo)245hp
- BMW 5 Series G30— 520i / 530i (B48 2.0 turbo)252hp
- BMW X2— sDrive18i / 20i / xDrive20i (B38 / B48)192hp
- BMW 2 Series— 218i / 220i / 230i (B38 / B48 turbo)184hp
- BMW 4 Series— 420i / 430i (B48 / N20 2.0 turbo)252hp
- BMW 3 Series E90— 318i / 320i 2.0 (N46)150hp
Known Issues
Direct injection → intake-valve carbon over time → rough running.
Fix / Workaround: Walnut-blast intake if rough; correct oil.
Repair cost: €250–€600
Typically appears after: 120,000 km
VANOS solenoids, PCV and turbo coolant lines with age.
Fix / Workaround: Clean oil; replace solenoids/lines as needed.
Repair cost: €150–€900
Typically appears after: 130,000 km
Mileage Thresholds
After 180,000 km: Carbon + ancillary window.
Pre-Purchase Checklist
- ☐330i is the sweet spot
- ☐Front-located chain (not N47 rear)
- ☐ZF 8-speed auto is excellent
Frequently asked questions
Is the Bmw 3 Series G20 318i / 320i / 330i (B48 2.0 turbo) reliable?
Maint. Sensitive — The 2.0 turbo petrols (B48, often with 48V mild-hybrid — shared across the 4/5-Series and X3) are strong, refined and among BMW's more robust modern fours: front-located timing chain (not the failure-prone N47 diesel rear), smooth and punchy. Cautions are the modern direct-injection norm: intake-valve carbon over time, VANOS/PCV and turbo-coolant attention, and the excellent ZF 8-speed auto (very robust — just service it). A documented car with a healthy chain is dependable and quick. The 330i is the sweet spot. Buy on oil and service history.
What are the common problems and reviews for the Bmw 3 Series G20 318i / 320i / 330i (B48 2.0 turbo)?
The most commonly reported problems: Intake carbon (DI), VANOS / PCV / turbo coolant.
Is a used Bmw 3 Series G20 318i / 320i / 330i (B48 2.0 turbo) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.