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If you have a yellow oil pressure warning light displaying then you may have 2 problems 1. Your oil level is way too low and needs topping up which very often means you are a sloppy owner that does not bother to regularly check the oil level in the engine and probably the other fluids as well.
2. There is a problem with the oil pressure and it is below the minimum needed to lubricate the engine.
What you need to do:
1. Check the oil level and top it up to the max level with the correct grade and type of oil as specified by Toyota for that engine. Do not overfill the sump. 2. Check to see if the oil pressure warning is continuing to display when the sump has been filled to the correct level. If you still have the oil pressure warning you need to have it investigated and the cause of the low pressure rectified otherwise you will destroy your engine if you continue to run it with less than minimum pressure. A mechanic needs in the first place to connect an independent oil pressure gauge to the engine to check the actual pressure readings. This will also eliminate any possibility that there is an issue with the oil pressure sensor and sender unit (which is not likely). .
That depends on the type of oil warning light being displayed. There are 2 types of warning lights
1. Low oil pressure light which all cars have
2. low oil level light which some cars have.
Low OIL PRESSURE warning means the oil pressure is below minimum and when this happens there will be insufficient lubrication of many engine parts because sufficient oil cannot get to all parts of the engine it is required to lubricate. Until the cause is identified and rectified the warning light will remain. If you run your engine with low oil pressure you will cause expensive damage to internal engine components.
Low OIL LEVEL warning means the oil in the sump has dropped to a dangerously low level (which may be due to an oil leak or abnormal oil consumption by the engine.) This warning means the oil level needs to be topped up and the warning will stay displayed until you top up the oil. Running the engine with low oil will cause expensive engine damage.
Since it is a 2 minute job, Oil levels should be checked fortnightly as a minimum, together with radiator coolant and power steering fluid levels, if you run the car most days each week as most people do.
It is possible for a warning light to remain displayed when the cause has been dealt with because there is a problem with the sender unit. However it needs to be established with alternative checks that the problem has been fixed before investigating if there is a problem with the warning light itself.
Run fault codes to find out what put the engine light on. Replace or repair asap as it is telling you that something serious has happened to the engine management systems. Check oil level and coolant level at the radiator. To ignore a warning light is an invitation to expensive disaster.
This is the "Low Oil Pressure Warning" light. It is RED for a reason! When this light (or any RED warning light for that matter) comes on, pull over and shut the engine OFF at once. Allowing the engine to run with insufficient oil pressure can cause a catastrophic failure in mere seconds. Such a failure can cost thousands of dollars to repair. This warning is most often the result of a very low oil level as indicated when checking on the oil dipstick. The engine oil level should be maintained as close to the "full" mark as possible - without exceeding it. Oil should never be allowed to drop below the "low" mark on the dipstick. If the oil level is shown to be between full and low, the light is probably coming on as a result of a faulty oil pump (the oil level should be checked with the vehicle parked on level ground, with the engine OFF). A faulty oil pump is unable to pump the oil with enough pressure to reach all the moving parts of the engine that require lubrication. Without proper lubrication, connected moving parts heat up, expand and seize. Moving parts are expected to move - not be prevented from moving. If your engine shut down, it may be the result of some of the internal parts seizing. Hopefully, this is not the case. Check the oil level and top off as needed to bring the level up and attempt to start the engine and have the vehicle checked by a trusted mechanic. Good luck!
You need to check your owners manual for the difinition of this light, it may just be the oil change light, or it could be a pressure or oil level light, have you checked the oil level just to be safe?