Oil Pressure Sensors

Is the oil light on even though the engine has enough oil, or is the gauge stuck at zero? A faulty oil pressure sensor can be the cause. This category brings together oil pressure sensors and senders, for example for older Jeep models, so you can get a reliable reading again.

What does an oil pressure sensor do?

The sensor sits on the engine and converts oil pressure into an electrical signal for the instrument cluster. Depending on the car, it can be a switch that only turns on the warning light at low pressure, or a sender that drives an oil pressure gauge. You can find other types under pressure sensors.

How to choose the right sensor

The sensor must match your model, year and engine, as thread, connector and signal can vary. The product names from OMIX state models and years, e.g. Jeep CJ and SJ 1974-86, Cherokee XJ 1992-96 and Grand Cherokee 1993-95. Also check whether the car has a gauge, a warning light or both. If your year is missing, you can browse other parts from OMIX.

Before you replace the sensor

A warning light that stays on or a gauge reading zero is not always caused by the sensor. Check the oil level, and ideally measure the pressure with a mechanical gauge to rule out a real pressure problem. Also check the wiring, connector and ground. When fitting, thread sealing should follow the instructions so the connection neither leaks oil nor loses ground contact.

Frequently asked questions

How do I know whether the problem is the sensor or the oil pressure?

Measure the pressure with a mechanical gauge in the sensor's threaded port. If it shows normal pressure while the instrument does not, this typically points to the sensor or the wiring. If the mechanical gauge shows low pressure, the engine should be inspected.

What is the difference between an oil pressure switch and an oil pressure sender?

A switch typically only turns on and off at a specific pressure and controls the warning light. A sender provides a varying signal that a gauge can display. Which type your car needs depends on the model and instrumentation.

Can I replace the oil pressure sensor myself?

Often yes, as the sensor is typically screwed directly into the engine. Use the correct tools, check that the thread matches, and follow the sealing instructions. Start the engine afterwards and check for oil leaks and a correct reading.