What’s Wrong With Your Oil Pressure Gauge?

Your car’s oil pressure gauge is so much more than just another dial on your dashboard — it’s an essential indication of your engine’s health. When it’s working as it should, it gives motorists real-time updates on the pressure of the oil in their engines. But, when the needle starts to behave unexpectedly, drivers are left scratching their heads. 

There are a whole host of reasons why your oil pressure gauge may flag an issue which we’ll explore in this blog. One thing is certain, though: the first thing to do is not to panic and seek assistance from a trained technician as soon as possible. There are simple solutions in many cases, and you’ll be back on the road in no time.

Why is oil pressure critical?

Good oil pressure is essential for keeping your engine running smoothly and preventing damage to your vehicle. Your car’s engine oil ensures that all moving parts are lubricated, reducing friction and allowing them to function correctly as they should. Engine oil also helps to dissipate wheat away from components, keeping your engine bearings cool and centring the crankshaft journal within its bearing shell for balanced and efficient performance. 

Good oil pressure also prevents the metal of the rotating shaft and the bearing shell from touching, limiting wear during start-up and shutdown. 

When your oil pressure is low, you risk friction, which can lead to your engine overheating. Low oil pressure can also cause engine damage because unlubricated metal touches it, wearing down the engine over time and creating rough patches. 

What's wrong with my oil pressure gauge?

Since oil pressure gauges contain many moving parts, there are plenty of common faults that can cause problems. The gauge works by measuring the pressure via a sensor; the oil circulates through the engine, ensuring it’s sufficient to lubricate and protect internal components. 

Let’s take a look at some of these common faults below.

Faulty sensors

Sometimes, your oil pressure gauge sensor can be faulty. This usually appears in the form of a warning light that flickers or stays on constantly. Alternatively, the readings it gives may be erratic and the engine might make unusual noises, such as knocking or ticking. A faulty oil pressure sensor can also cause oil leaks. 

False readings

False readings from your oil gauge may be caused by cold weather, as this thickens the oil (though, it’s normal for the oil to be flagged when the car first starts because it needs to be thinned by the heat of the engine). A false read can also be linked to engine idling, especially in older cars, as oil pressures naturally drop at lower RPMs.

Electrical faults

Your oil pressure gauge’s issue may be down to an electrical fault; there might be loose connections, wiring issues, or even a blown fuse from voltage irregularities. 

Mechanical failures

Worn-out gauge mechanisms will also prevent your oil pressure gauge from working. The internal components of the system it relies on, such as springs and needles, can wear out or become stuck, leading to inaccurate readings. Blockages in the oil line that feed the gauge (for example, sludge, debris, or degraded oil) can also prevent the gauge from detecting pressure changes accurately. 

Diagnosing your oil pressure gauge

There are a few steps to see what is wrong with your car’s oil pressure gauge. If you’re unsure, always seek expert advice before attempting anything with your vehicle to prevent further damage or fault. 

• You can check your oil level and quality to see if you’re due an oil change. 
• Inspect the sensor and connections to see if there is a fault.
• Test the gauge using a manual pressure tester. 

Check-in with a professional mechanic when there are persistent warning signs, visible oil leaks, and unusual noises. It’s always best to have an expert give you clarity and confidence so you know that you’re driving safely. You can book in for a service or oil change with your local Kwik Fit to find the solutions you’re looking for.

Can I drive with a faulty oil pressure gauge?

No, it is safer not to drive with a faulty oil pressure gauge. You can cause further damage to your car if the oil is not circulating around your engine efficiently or at all. Driving may even cause permanent damage to your car, so once your emergency light turns on, it is time to check in with a mechanic. 

Preventing future issues

Ensure you regularly maintain your car with oil changes and sensor checks. It’s really important to monitor your oil pressure gauge for changes — checking every 3 months or every 3000 miles is a great habit to be getting into. 

Depending on your car model, a regular oil pressure gauge reading for a running engine can range from 20 to 65 PSI. You can upgrade to a more reliable and modern gauge to give your car a new lease of life. Keeping an eye out for early warning signs and dealing with them immediately will also help prevent more severe damage. 

Ask the experts at Kwik Fit

The experts at Kwik Fit are always on hand to diagnose and resolve your car’s issues. Contact us today for all your car-related queries, from Free Vehicle Safety Checks to MOTs and a range of service packages, our team of expert technicians will help keep your car on the road. And, with centres in over 600 locations across the UK, you’re sure to find a Kwik Centre near you.