KNOWN FAULTS · BMW

Known faults for the BMW Serie 1 (F40).

2019–2024 · Petrol / Diesel

Sources are not verified in real time and no entry confirms that your car is affected.

2 known faults with sources

Engines: 116i / 118i (B38) (Petrol)

Crankshaft thrust bearing and carbon on the 1.5 three-cylinder (B38)Engine

Engine / equipment: 1.5 three-cylinder B38 (also in the plug-in hybrids): BMW 1 Series, 2 Series Active Tourer, X1, X2 and MINI
Period mentioned: 2014 onwards
Symptoms: On early engines with a manual gearbox, crankshaft thrust-bearing damage that can end in serious failure; over the years, loss of power and higher consumption from carbon in the intake, valves and injectors.
Possible cause described: The half-shell thrust bearing was too weak; a 360-degree one has been fitted since April 2015. BMW issued no recall but offered goodwill repairs. The German guide sees no chain problems and says early oil consumption has largely disappeared; the petrol particulate filter (from March 2018) rarely causes trouble.
Check for the garage: On engines before April 2015 with a manual gearbox, ask BMW whether the bearing upgrade was done and listen for crankshaft noises; use quality fuel and inspect the intake if power drops.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Engines: 128ti / M135i (B48/B46) (Petrol) · 116d / 118d / 120d (B37/B47) (Diesel)

B-engine coolant leaks and EGR coolerCooling / EGR

Engine / equipment: B47 and B57 diesel and B48 and B58 petrol modular engines (BMW from 2014–2015 and MINI from 2014)
Period mentioned: 2014–2026
Symptoms: Coolant loss with a low-level warning, coolant or oil residue at the rear of the engine; on diesels, internal coolant loss with no visible leak (EGR cooler).
Possible cause described: On the B48 and B58 the water pump leaks (from its weep hole) and the oil filter housing with heat exchanger can crack; on 2017–2021 B58s the crankcase ventilation valve also fails. On the diesels the EGR cooler can leak internally and mix coolant with soot: BMW issued a recall over the risk of the intake manifold catching fire.
Check for the garage: Check the coolant level, look for leaks under the water pump and at the oil filter housing, and on diesels confirm by VIN whether the EGR cooler campaign was done.
Cost cited in the source: Water pump: relatively cheap to replace; oil filter housing: more labour-intensive; EGR cooler: free if covered by the campaignA rough figure from the original database, not an up-to-date quote.

Mileage cited in the database: 80,000–195,000 km. This is not a maintenance interval and does not predict a failure.