What does it mean when the R light is on?
2 Answers
R light is the engine oil warning light. It illuminates when there is no oil pressure. You should immediately check whether the oil level is insufficient, whether the oil pump is not rotating, or whether the oil filter is clogged. If these issues can be ruled out, it may indicate a fault with the oil pressure sensor. Engine oil has a friction-reducing effect: A sufficiently thick oil film separates the surfaces of relatively sliding parts, thereby reducing wear. Engine oil has a sealing effect: Engine oil can form a sealing ring between the piston rings and the piston, reducing gas leakage and preventing external contaminants from entering. Engine oil has an anti-rust effect: Lubricating oil can adhere to the surface of parts, preventing contact with water, air, acidic substances, and harmful gases. Engine oil has a cushioning effect: When the pressure in the engine cylinder rises sharply, suddenly increasing the load on the piston, piston skirt, connecting rod, and crankshaft bearings, this load is transmitted and lubricated through the bearings, cushioning the impact load. Engine oil has a cleaning effect: Good engine oil can carry carbon deposits, sludge, and worn metal particles from engine parts back to the oil tank through circulation, washing away dirt generated on the working surfaces of the parts through the flow of the lubricating oil.
With over a decade of driving experience, I know that reverse lights normally illuminate when shifting into reverse gear to alert vehicles and pedestrians behind. If the light stays on continuously, it's a cause for concern. Possible reasons include a stuck reverse light switch or a short circuit in the wiring. For instance, the switch located near the transmission can get stuck due to vibration or dirt buildup. I've encountered this issue several times, most commonly due to a faulty switch that needs replacement at a repair shop. Wiring problems, such as aged wires causing a short circuit or blown fuses, should also be checked—start by inspecting the fuse box for any melted fuses related to the reverse lights. Non-functional reverse lights are particularly dangerous, especially in parking lots where others can't see your movements, increasing collision risks. Therefore, I recommend a weekly basic check of the lighting system—have someone observe if the lights turn on and off properly when starting the car. If the light remains on, visit a reputable repair shop promptly. The cost is usually low, but safety comes first. Unstable battery voltage can also cause abnormalities. In short, don’t delay minor issues that could escalate into major problems.
