118i 1.5 Turbo (B38)
2015–2019 · petrol · 1499cc · 136hp
Engine codes: B38B15
Reliability, common problems and owner reviews for the Bmw 1 Series F20 118i 1.5 Turbo (B38). Check this before you buy used.
The 136 hp B38 three-cylinder (F20 118i 2015–2019) replaced the troubled N13 and is a clear improvement: robust front timing chain, no known design flaw. The recurring complaints are coolant leaks (including at the turbo coolant lines), three-cylinder vibration that wears the engine mounts, and direct-injection carbon over time. A sensible, cheap-to-run choice.
Known Issues
Coolant loss from the turbo coolant lines or plastic pipes; low-coolant warnings, sometimes white smoke.
Fix / Workaround: Pressure-test the system and replace the leaking line; do not keep topping up.
Repair cost: €150–€500
Typically appears after: 80,000 km
Three-cylinder vibration at idle wears the engine mounts faster.
Fix / Workaround: Replace mounts when idle vibration grows.
Repair cost: €150–€400
Typically appears after: 100,000 km
Pre-Purchase Checklist
- ☐Coolant level and any low-coolant history
- ☐Idle vibration in the cabin
- ☐Regular oil service, not just Longlife
Frequently asked questions
Is the Bmw 1 Series F20 118i 1.5 Turbo (B38) reliable?
Reliable — The 136 hp B38 three-cylinder (F20 118i 2015–2019) replaced the troubled N13 and is a clear improvement: robust front timing chain, no known design flaw. The recurring complaints are coolant leaks (including at the turbo coolant lines), three-cylinder vibration that wears the engine mounts, and direct-injection carbon over time. A sensible, cheap-to-run choice.
What are the common problems and reviews for the Bmw 1 Series F20 118i 1.5 Turbo (B38)?
The most commonly reported problems: Coolant leaks (turbo lines, pipes), Engine mounts and vibration.
Is a used Bmw 1 Series F20 118i 1.5 Turbo (B38) worth buying?
Minor issues only, easy to maintain, no design flaws. A safe used buy.