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.

A: Hello, thank you for writing in. The sensor...

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Car stops slower & brake pedal goes to floor

Sounds like you may have some internal leakage in the brake master cylinder. The brake master cylinder, if it is leaking internally, will maintain fluid level and allow the pedal to drop. It is possible that the leak is small...

Q: Bad clutch

If the clutch is slipping, then a new clutch will most likely need to be installed. The flywheel will need to be inspected and possibly machined, if there are gouges or hotspots. You may want to enlist the help of...

Q: Check engine light came on, diagnostic was done and came up with codes saying pressure control solenoid 2,3, & 5 are shut off.

Low transmission fluid is a major cause of transmission failures. Your pressure control solenoids turned off to try to prevent damage to transmission components like clutches etc. Unfortunately, the damage is done and changing the fluid will not help, and...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.