"Is the 1 Serisi 116i reliable, and what should you check?"
The most commonly reported issue when buying a used BMW 1 Series 116i 2018 (F20 / F21 / LCI / 2): thermostat and water pump failures. Carbon buildup and clogged injectors are also frequently reported.
Engine: B38
B38B15A · 116i · Used in this car from 2016-2019
Known engine issues
Crankshaft thrust bearingEngines up to 2015 suffered from excessive axial clearance on the crankshaft, and the thrust bearing failed at 50,000 km. The design was later revised.
Cracks in the manifoldThe aluminum turbocharger housing with water cooling is integrated with the exhaust manifold and cracks from overheating, leading to coolant leakage.
Floating idleAs with all direct injection engines, intake valves become coked with carbon deposits, resulting in floating idle and unstable engine operation.
+1 more issues on the engine detail page
Known issues and risks
Listed from most frequently reported, each with its source.
Thermostat and water pump failures
Often reported
In B38 engines, the electronic thermostat or water pump may fail, causing erratic temperature readings or overheating. The issue can appear after tens of thousands of kilometers and triggers warning lights and abnormal cooling cycles.
Cooling
Carbon buildup and clogged injectors
Often reported
The B38 1.5 direct injection engine is reported to have a tendency for carbon buildup on intake valves and ports; this can cause rough idle, power loss, intake backfire, and performance drop.
Engine Internal
Oil leaks and abnormal oil consumption
Often reported
In the 1.5 B38 engine, oil leaks from the valve cover gasket and higher than normal oil consumption are reported. The valve cover gasket can harden and leak; in some cases, leaks may also occur from the oil pan.
Engine Internal
Rough idle, hesitation on acceleration, and lack of response
Often reported
Owners and forums report rough idle, hesitation during acceleration, and a feeling of poor engine response, especially in the 109 HP version. In some cases, these symptoms are resolved with injector cleaning, software update, or ECU reprogramming.
Fuel System
BMW 1 Serisi 116i technical specs
BMW 1 Serisi 116i (2018): boot 360 L; fuel use 5,4 l/100 km (urban 6,8 l/100 km · extra-urban 4,6 l/100 km); 0–100 in 10.9 s.
Boot capacity
360 L
Fuel consumption
5,4 l/100 km (urban 6,8 l/100 km · extra-urban 4,6 l/100 km)
What should I look for when buying a BMW 1 Series 116i?+
When buying a 2018 116i, check the service history, test drive, and look for engine/transmission warnings. Most commonly reported issues: thermostat and water pump failures; carbon buildup and clogged injectors; oil leaks and abnormal oil consumption.
What are the chronic problems of the BMW 1 Series 116i?+
Most commonly reported issues: thermostat and water pump failures; carbon buildup and clogged injectors; oil leaks and abnormal oil consumption.
Is the BMW 1 Series 116i reliable?+
Rather than a simple yes/no, it's best to weigh the proven pros and cons together. This page lists 4 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from the Difetti fault database; brand, fuel, engine, and generation compatibility between the source vehicle and target vehicle are verified. Topics with insufficient evidence are not shown.