We have had problems with this car's cooling system off and on for a few years now, and my daughter just had everything worked on and replaced in the cooling system, now after driving about 25 miles the engine oil pressure light starts blinking, and we have checked the oil several times and it is right on the full line?
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Re: OIL SENSOR LIGHT FLASHING
In some newer cars, they have light that blink like this to tell you that you need an oil change. they are just set on a timer to go off every 3500-5500 miles or it could be a malfuctioning oil pressure sensor. either way its a eawsy fix. take the car to a oil change shop to have them verify which one.
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You did not say how cold it is but I am guessing that the viscosity is not correct for the temperature and the oil is too heavy for the job.. May be an oil change to the correct viscosity oil would help.
If your oil level is good, that is between the low and high marks, that light blinking is an indicator there is a problem with your oil pressure. The light flashing could be low oil level, a bad oil pressure sensor, your oil pump going out or a clogged line or pick up. Start by checking your oil level, then test the sensor if both are good drain your oil and pull the oil pan off to see if the pick up is clogged, if it is clean it. If everything is good at this point then the problem is the pump itself and you'll need to replace the pump.
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.
The type of oil in the engine will not affect the check engine light. The engine light only comes on when something in the engine management system is out of specifications. Any sensor reading out of specification, e.g. oxygen sensor, mass air flow sensor, throttle position sensor etc., will trip the engine light. The only way I can think that the oil changers could be responsible is if they moved or damaged some wiring or a sensor etc. while doing the oil change.