Skip the auto shop - Our mechanics make house calls

Q: Oil pressure light comes on in the morning when the car is cold, but goes off if I turn the car off then back on.

asked by on

Oil pressure light flashes in the morning when the engine is cold. If I turn the car right back off then right back on, the light stays off. The car is running fine, just had an oil change 200 miles ago. Could this just be a faulty sensor?

My car has 68000 miles.

Hello, thank you for writing in. The sensor, or oil pressure switch, can be tested. If the sensor appears to be within the factory spec, the first thing to check is if you have the right viscosity oil. If the wrong oil, particularly higher viscosity, is put in, the oil pump will not, at least initially, generate pressure as intended. If this issue just started after the oil was changed, of course that itself suggests the foregoing possibility (wrong oil). Assuming the oil is not the issue, and the sensor or switch is OK, it is easy to verify the oil pressure using an external test gauge and of course the pressure should be verified because if there is inadequate oil pressure such will will prematurely wear out the engine bearings. Here at YourMechanic, we can have a technician come to your home or office to inspect and diagnose this issue for you, and make or suggest the necessary repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Oil pressure light comes on in the morning when the car is cold, but goes off if I turn the car off then back on.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: water getting into sump

It isn't necessarily a cracked head or block. There are other places that water can get into the oil. One that is often overlooked is the oil cooler. Many of the VW engines have a "black Box" oil cooler fitted...

Q: Gauges not working

Hello. If only your tachometer and speedometer aren't working, the problem is probably with the instrument cluster itself. This is because these two gauges use completely different inputs. The speedometer gets its signal from the vehicle speed sensor (VSS), whereas...

Q: Traction and Check Engine Light on

Hey there. Your car is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU. ...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...