2. When the ignition is turned on, electric current passes through the oil level sensor. The change in the sensor resistance due to its heating by current varies depending on the depth of immersion of the sensor in the oil. The electronic control unit measures the change in resistance of the sensor and, based on this data, determines whether the oil level is too low.
3. If the oil level is normal, the indicator lamp lights up for 2 seconds when the ignition is turned on and then goes out. When the oil level is low, the lamp does not go out after the first 2 seconds, but starts flashing.
4. The system does not operate when the engine is running, which is achieved by grounding the system control unit via the low oil pressure warning light switch (on some late 1984 models the corresponding wiring is not provided, but it can be installed - consult a Peugeot center).
[Source of the article is website: www.PeugeotBook.ru]
5. The system warning light may start flashing even with a normal oil level if the vehicle is parked on a slope or if the engine is turned off and on again before the oil has had time to return to the sump. To stop the light from flashing in this situation, move the car to a level surface or turn off the engine for a few seconds.