Just Changed the Oil, Why is the Oil Warning Light Still On?
1 Answers
Normally, the oil warning light on the dashboard should illuminate when the ignition is turned on. Below is an explanation of why the oil warning light may still be on after an oil change: 1. Causes: (1) Insufficient oil level (relatively common) - The oil pump's output decreases or fails to pump oil due to air intake, leading to a drop in oil pressure and triggering the warning light. (2) Faulty oil pressure switch (oil sensor) (relatively common). (3) Short circuit in the warning light circuit, preventing the light from turning off. (4) Fault in the wiring between the oil pressure switch and the dashboard. (5) Dashboard malfunction (very unlikely). (6) Insufficient pressure in the engine's internal lubrication system (relatively common). 2. Fault Diagnosis and Repair: (1) Insufficient oil level: If the oil level is too low, the oil pump's output decreases or fails to pump oil due to air intake, causing a drop in oil pressure. This leads to increased wear on the crankshaft and bearings, as well as the cylinder liners and pistons due to poor lubrication. Therefore, check the oil level in the oil pan daily before operation and ensure it is adequate. If low, top up with the same type of oil from the same manufacturer. (2) Oil pump failure: If the oil pump's drive gear or drive shaft key is damaged or dislodged, or if the oil pickup screen is damaged, allowing debris to enter and jam the gears, the oil pump may stop working, causing oil pressure to drop to zero. In this case, replace the damaged key or oil pickup screen.
