Q: Oil and battery light keeps coming on

asked by on March 05, 2017

Hi I recently drove my car then the oil and battery light came on and it wouldnt start back up but the radio and everything else still works so I took it to a shop they charged me 300 and said it was the engine coil replaced it and said it was okay but now my car won't start up again and the oil and battery light keeps coming on what do you think is the problem

My car has 15400 miles.
My car has an automatic transmission.

Alternator Replacement $149.30 - $1362.41 Get a Quote
Oil Pressure Sensor Replacement $88.87 - $220.77 Get a Quote

It sounds like you may have a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator charges the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator pulley. The voltage regulator is a unit that regulates the charging of the battery by the alternator and maintaining a certain amperage while the engine runs. When the alternator is not working properly, this may result in the battery quickly losing charge and the car losing all power. You may also notice a whining sound as a result of the bearings inside the alternator begin to fail.

The oil pressure light will usually come on when a few things could be happening. Either the motor is in fact low on oil, the oil pump could be failing or the oil pressure sending unit is not working properly and may be producing a faulty reading. If the engine is in fact low on oil, you may notice the temperature gauge reading above normal temperatures as a result of the lack of sufficient oil in the motor. I would recommend checking the actual oil level in the motor by using the dipstick. Be sure the oil level reaches the "full" mark. If this registers as "full" then you likely have a faulty oil pressure sending unit. Many vehicles also have a safety feature built into the vehicle’s computer system which will shut the engine down completely or trigger a “safe mode” of some kind which will drastically limit the vehicle’s engine power to avoid further engine damage until the oil pressure problem is corrected. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

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