If the oil level sensor is faulty, the oil warning light does not function properly under certain circumstances - if at all. An engine failure is inevitable. Therefore, we recommend you replace the oil level sensor at the slightest sign of malfunction. Piaggio / Derbi original spare part. Suitable for geared mopeds Aprilia RX, SX, Derbi Senda, GP1, Gilera RCR, SMT. OEM No. for comparison: 867531