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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.
Sounds electrical (bad earth, chaffed wire, dirty fuse) but get the garage to put a oil pressure gauge on the car to make sure the oil pressure isn't low.
ABS light will mean brakes still work but not as efficiently so drive with care particularly in the wet.
If you've checked your coolant level and it is ok, then more than likely engine oil is contaminating your cooling system. GM published a service bulletin on this exact problem. Possible sources of contamination are internal engine leaks, improper service procedures, or addition of excessive antileak addatives into the cooling system. The problem occurs when the oil leaves deposits
on the "low coolant warning sensor" which causes a false reading and puts the light on. The sensor is mounted on the right hand tank of the radiator. Flush the cooling system, replace the sensor, and add the proper amount of O.E. recommended coolant.
You may have to reset it by putting in a code. You can find the code in your owners manual. In our Grand Am we have to reset the Check Oil light after we change the oil. For the oil light it is something like press the gas peddle in 5 times within 30 seconds....something like that. Good luck
Most likely it is the sensor, it is located on the radiator near the battery, it will stay off if you unplug it, Check the fuses and relays though just to make sure, oil pressure sensor possibly but again check fuses
High temp could be low coolant check your coolant level. Low oil-check for leaks, if no leaks then check for blue smoke out exhaust, if no blue smoke it could just be low. A vehicle will go through a quart of oil between oil changes, even a newer one.
Open the DIS [Driver Information System] with the car running. The screen should flash all the annoying messages. Press the "Fuel" button repeatedly until the messages clear and it displays your fuel used. The press the Eng button until it shows your Oil Life, then hold down the reset button for 10 seconds. Then press Eng again till it shows your Transmission Fluid Life, and hold down the reset button for 10 seconds. As for the coolant indicator, make sure the reservoir is filled to the appropriate level. If you still get the Low Coolant message, check to make sure the coolant level sensor is plugged in (its on the reservoir) and if it is, then it may need replaced or cleaned.
Check you coolant resevoir. The low coolant switch is located in the resevoir so if it is low on coolant there, the light will come on. If it is full, it could be that the switch is stuck due to gunk build up in the resevoir. Hope this helps you out