B48
BMW · 2.0L Turbo I4
2014–present
"B58s little brother. Efficient, smooth. Remap to 260hp safe. Best modern 4-cyl BMW."
Mileage Risk Timeline
When problems typically appear — enter your mileage to see your risk zone
Known Issues 3
Coolant vent line failure
▸Coolant warning light, minor coolant loss
Small coolant vent line can crack or detach. Cheap part, can cause coolant loss if undetected.
Quick visual at any service. €100-250. Low overall risk.
Oil filter housing gasket — early units (2014-2016)
▸Oil drips under car, burning smell, oil residue on underside
Early B48 higher OFHG failure rate. BMW revised gasket material. 2017+ mostly unaffected.
Check service history on pre-2017 cars. If not done and 80k+ km: inspect. €250-500.
Intake valve carbon buildup (DI)
▸Rough idle, slight power loss, cold start misfires
Direct injection = no fuel washing intake valves. Walnut blasting cleans it.
Less concern in Greece — warm climate and highway driving reduce buildup. Clean at 80-100k km if symptoms.
This report covers the combustion engine only. Battery and electric motor reliability are not included.
Models with B48 40
Other BMW Engines
Tuning Potential
260hp Stage 1 safe
Frequently Asked Questions
Is the BMW B48 reliable?
The BMW B48 scores 82/100 with a verdict of BUY. It has 3 documented issues with total repair costs between €650 and €1,350.
What are the common problems with the B48?
The most common issues are:
- Coolant vent line failure — moderate, repair cost €100–€250, 40,000 km–100,000 km
- Oil filter housing gasket — early units (2014-2016) — moderate, repair cost €250–€500, 40,000 km–100,000 km
- Intake valve carbon buildup (DI) — minor, repair cost €300–€600, 60,000 km–120,000 km
What cars use the BMW B48?
How much does it cost to repair the B48?
Total potential repair costs for all 3 known issues range from €650 to €1,350. The most expensive issue is typically .
What years was the B48 produced?
The BMW B48 was produced from 2014 to present. It is a 1998cc I4 petrol turbo engine.
Verdict and scores are editorial opinions based on aggregated data. Learn about our methodology. Not a substitute for professional inspection.