Symptoms of a bad oil pressure sensor: how to change

The oil pressure sensor is a critical component in your vehicle engine, responsible for monitoring the oil pressure and ensuring that your engine is adequately lubricated. When this sensor malfunctions, it can lead to a range of issues that, if left unaddressed, could result in significant engine damage. Understanding the symptoms of a bad oil pressure sensor can help you take timely action to prevent more severe problems.

signs of bad oil pressure sensor

What does the oil pressure sensor do?

The oil pressure sensor is usually located near the oil filter or the oil pump. It monitors the oil pressure within a car engine and sends this data to the engine control unit (ECU) and the dashboard. It ensures the engine receives proper lubrication by maintaining adequate oil pressure, which reduces friction and prevents wear on engine components. If the oil pressure drops too low, the sensor triggers a warning light on the dashboard, alerting the driver to potential issues. This allows the driver to take immediate action, such as checking the oil level, to prevent engine damage.

The sensor’s data also enables the ECU to make necessary adjustments to protect the engine, ensuring optimal performance and longevity. A functioning oil pressure sensor is vital for maintaining engine health and preventing costly repairs.

Common symptoms of a bad oil pressure sensor

Here I have tried to highlight the bad oil pressure sensor symptoms for your kind information.

1. Oil pressure warning light

The most obvious symptom of a bad oil pressure sensor is the illumination of the oil pressure warning light on your dashboard. This light is triggered when the sensor detects low oil pressure, but a faulty sensor can cause it to illuminate even if the oil pressure is within a normal range. If this light comes on, it is essential to check the oil level and pressure to determine if it is a sensor issue or an actual oil pressure problem.

2. Erratic oil pressure gauge readings

If your vehicle has an oil pressure gauge, you might notice erratic or fluctuating readings. A bad oil pressure sensor can send incorrect signals to the gauge, causing it to display readings that jump up and down or are consistently inaccurate. This can make it challenging to determine the proper oil pressure in your engine.

3. Noisy engine

Low oil pressure can lead to insufficient lubrication, causing increased friction between engine components. This can result in unusual engine noises such as knocking, ticking, or clattering sounds. Hearing these noises could indicate that the oil pressure sensor is not accurately monitoring the oil pressure, leading to inadequate lubrication.

4. Engine performance issues

A malfunctioning oil pressure sensor can cause the engine control unit (ECU) to receive incorrect information about the oil pressure. In response, the ECU might adjust the engine’s performance settings, leading to issues such as reduced power, poor acceleration, or stalling. These performance problems can be particularly noticeable during driving conditions that demand more from the engine.

5. Oil leaks

Sometimes, a faulty oil pressure sensor can develop a leak. If you notice oil spots under your vehicle or a drop in oil level without apparent reason, it could be due to a leaking oil pressure sensor. Inspect the area around the sensor for signs of oil leakage.

6. Check engine light

Sometimes, a bad oil pressure sensor can trigger the check engine light. This happens because the ECU detects a fault in the sensor or the oil pressure system and logs a diagnostic trouble code (DTC). If the check engine light comes on, it is crucial to have the vehicle scanned for codes to identify the underlying issue.

What causes oil pressure sensor to go bad?

Several factors can lead to the malfunctioning of an oil pressure sensor. Understanding these causes can help diagnose and prevent sensor failure. Here are the primary reasons an oil pressure sensor might go bad:

1. Wear and tear

Like all mechanical and electronic components, oil pressure sensors are subject to wear and tear over time. Continuous exposure to engine heat and vibrations can degrade the sensor’s internal components.

2. Contaminated oil

Dirty or contaminated oil can cause deposits and sludge to build up within the sensor, obstructing its ability to measure oil pressure accurately. Regular oil changes and using high-quality oil can mitigate this risk.

3. Electrical issues

Faulty wiring or poor electrical connections can lead to sensor malfunction. Corroded or loose connections can disrupt the signal between the sensor and the engine control unit (ECU), resulting in inaccurate readings.

4. Physical damage

Physical damage to the sensor, such as impact from debris or improper installation, can impair its functionality. Ensuring the sensor is securely and correctly installed can prevent such issues.

5. Exposure to extreme temperatures

Prolonged exposure to extreme engine temperatures can cause the sensor’s electronic components to fail and excessive heat can damage the sensor’s diaphragm and internal circuits.

6. Oil leaks

Oil leaks around the sensor can cause it to malfunction. Leaking oil can damage the sensor’s electrical connectors and housing, leading to inaccurate readings or complete failure.

7. Manufacturing defects

The oil pressure sensor may sometimes fail prematurely due to manufacturing defects. While this is less common, it can happen and typically results in early sensor failure.

How to change oil pressure sensor?

Changing an oil pressure sensor is a relatively straightforward process that can be done with essential tools. Here is a step-by-step guide to help you replace a faulty oil pressure sensor:

Tools and materials needed:

  • New oil pressure sensor
  • Wrench set
  • Oil pressure sensor socket
  • Thread sealant or Teflon tape
  • Rag or paper towels
  • Safety gloves and glasses
  • Jack and jack stands

Step by step instructions:

Prepare vehicle

Park your car on a flat surface and allow the engine to cool down to avoid burns from hot components.

Disconnect battery

Disconnect the negative terminal of the battery to prevent any electrical shorts or shocks while working on the sensor.

Locate oil pressure sensor

Consult your vehicle’s manual to find the exact location of the oil pressure sensor. Typically, it is located near the oil filter or on the engine block.

Access sensor

Depending on the sensor location, you might need to lift the vehicle using a jack and secure it with jack stands. Ensure the car is stable before crawling underneath.

Disconnect electrical connector

Locate the electrical connector attached to the oil pressure sensor and carefully disconnect it. You may need to release a clip or tab to unplug it.

Remove old sensor

Using the appropriate wrench or oil pressure sensor socket, loosen and remove old sensor. Be prepared for a small amount of oil to leak out when you remove it, and have a rag or paper towels ready to clean up any spills.

oil pressure sensor

Prepare new sensor

If the new sensor requires thread sealant or Teflon tape, apply it to the threads. This helps prevent oil leaks once the sensor is installed.

Install new sensor

Carefully screw the new oil pressure sensor into the engine by hand to avoid cross-threading. Once hand-tight, use the wrench or sensor socket to snug it down. Do not over-tighten, as this could damage the sensor or the threads.

Reconnect electrical connector

Reattach the electrical connector to the new oil pressure sensor. Ensure it is securely connected and the clip or tab is engaged.

Reconnect battery

Reconnect the negative terminal of the battery.

Start engine and check for leaks

Start the engine and check for any oil leaks around the sensor. Also, monitor the oil pressure gauge or warning light to ensure the new sensor functions correctly.

Lower vehicle

If you had to lift the vehicle, carefully lower it back to the ground.

How much does it cost to replace an oil pressure sensor?

The cost of replacing an oil pressure sensor varies, typically from $70 to $250. The price of a new oil pressure sensor itself usually falls between $50 and $100, depending on the make and model of your vehicle, and the aftermarket or OEM sensor. If you choose to replace the sensor yourself, you will only need to cover the cost of the sensor and any necessary tools, which can save you a significant amount.

However, labor costs will be an additional expense if you opt for a professional replacement. Labor rates can vary widely based on location and the mechanic’s expertise, but generally, you can expect to pay between $70 and $150 for labor. The total cost, combining the price of the sensor and labor, typically ranges from around $130 to $375. Regular maintenance and timely replacement of faulty sensors can prevent more severe engine issues and ensure your vehicle runs smoothly.

How long does it take to replace an oil pressure sensor?

Replacing an oil pressure sensor is generally quick and straightforward, typically taking between 0.8 hours to 1.5 hours for most vehicles. The exact time required can vary depending on the specific make and model of your automobile, as well as the location of the sensor. In some cases, the sensor is easily accessible and can be replaced quickly. In other instances, it might be located in a more challenging spot, requiring additional time to reach and replace.

For a professional mechanic with the necessary tools and experience, the job can often be completed on the shorter end of this time range. If you decide to do it yourself, it might take a bit longer, especially if you are unfamiliar with the process or need to consult your vehicle’s manual for guidance. Regardless, replacing an oil pressure sensor is typically a manageable task that can be done relatively quickly.


A malfunctioning oil pressure sensor can lead to various symptoms that may mimic more severe engine problems. If you suspect your oil pressure sensor is faulty, it is essential to address the issue promptly. Regular maintenance and timely replacement of faulty sensors can help ensure your engine remains well-lubricated and operates smoothly.


Mohammad Shafiqule Islam is a seasoned mechanical engineer with over 16 years of experience in automotive maintenance and training. He combines technical expertise with a passion for the automotive industry. His extensive background includes hands-on maintenance, diagnostics, and advanced training, making him a valuable resource for industry insights and practical advice. Shafiqule's engaging writing style and deep knowledge ensure that his content is both informative and accessible, catering to professionals and car enthusiasts. His dedication to continuous learning and sharing insights helps you stay informed about the latest advancements and best practices in automotive maintenance.

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