Oil-pressure sensor
Reports lubrication-system pressure or a pressure threshold.
Threaded into an oil gallery or filter-housing assembly.
A switch or variable sensor signals pressure status; the exact signal type depends on the engine.
A messenger checking that the oil supply is working.
Warnings can be electrical or reflect genuine low pressure; an actual pressure test may be needed.
Fluids use vehicle-specific schedules. Seals, pumps and heat exchangers depend on age, condition and operating history.
Simple seals and filters can be accessible; an integrated pump, buried housing or overheating damage can make repairs more involved.
Oil level and oil pressure are different measurements in a BMW.
BMW combustion models; additional coolant circuits also appear in hybrids and electric BMWs.