Skip the auto shop - Our mechanics make house calls

Q: will a defective oil pressure sensing system prevent engine starting even if it turns over

asked by on

i thought it had run out of fuel put fuel init would not start. changed filters proceeded to purge air as per instructions. fuel pump is working. as i cranked motor over it seemed to want start but would not.i observed there was no oil pressure indicated at cranking speed.then im told by my friend the oil pressure gauge and fuel gauge had been sporaticaly not working. realizing there would be engine protection for no oil pressure.my question is would a bad oil sensor or something in that protection system prevent engine from starting.

My car has 150000 miles.
My car has an automatic transmission.

A: Hello. If the oil pressure sensor was bad i...

Hello. If the oil pressure sensor was bad it would not keep the vehicle from starting. If there is no oil pressure on the gauge when starting it then there is a supply issue. Most of the time this is an issue with the low pressure oil pump.

I usually start the diagnostic process by removing the pressure relief valve for the pump to make sure it is not sticking. If it is then it can be replaced and that may fix the issue. If not then it may need the pump.

If you need to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your starting issue firsthand.

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: ABS T/C error light

Hey there, thanks for writing in about your 2006 Buick Terraza. There is a possibility of the connector C305 under the drivers seat on the rear getting corrosion and damage from water getting on the connector. The connector is not...

Q: Why is my pickup running rough?

Hey there. You should take a fuel sample in a clear glass container, and then if you put the container in a freezer, it will separate the water from the fuel and you will see if you have a lot...

Q: Sludge in engine, constantly low on oil

If you are losing that much oil, and there are no external leaks (leaks that are visible outside), your vehicle may be consuming the oil. Unfortunately this can be harder to diagnose than an external leak. The valve guides 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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...