What Is an Oil Pressure Sensor?
An oil pressure sensor (or sending unit) is a small, screw-in device on the engine block. It monitors oil pressure and sends signals to the car’s computer. If pressure drops below safe levels, the warning light appears on the dashboard.
Without this sensor, drivers could run their engines dry without noticing—until serious and expensive damage occurs.
How Does It Work?
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Pressure detection – A diaphragm or piezoelectric element flexes under oil pressure.
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Signal generation – This movement changes resistance, which the ECU reads as voltage.
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Driver alert – If voltage signals low pressure, the oil lamp is triggered.
Many modern vehicles use two sensors—one for warnings under 0.6 bar and another for digital display readings.
Why the Oil Pressure Sensor Is So Important
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Early warning – Detects leaks, clogged filters, or pump failures.
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Engine protection – Ensures smooth lubrication and prevents overheating.
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Maintenance planning – Helps identify wear in bearings or failing oil pumps early.
Signs of a Failing Oil Pressure Sensor
| Symptom | What It Looks Like | Why It Happens |
|---|---|---|
| Intermittent oil light | Flickers at idle, disappears while driving | Internal resistance fluctuates. |
| Erratic pressure readings | Gauge jumps from 0 to 120 PSI | Cracked diaphragm or corroded connection. |
| Oil leak around sensor | Wet housing or residue on engine block | Faulty seal or loose thread. |
| Engine ticking or tapping | Metallic noise, especially on cold starts | Actual low oil pressure starving components. |
Pro Tip: Never assume the sensor is wrong. First, check oil level with the dipstick. If the level is okay, confirm pressure using a mechanical gauge before replacing the sensor.
Real-World UAE Cases
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Toyota Corolla: Warning light flicked on during braking. Diagnosis showed a faulty sensor. AED 150 fix saved AED 2,000 in unnecessary repairs.
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Hyundai Accent: Driver ignored the oil warning for a week. Result? Wrecked crankshaft bearings and a full rebuild costing AED 9,000.
How to Test and Replace the Oil Pressure Sensor
Step-by-Step Testing
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Scan for OBD-II codes – Look for P0520–P0524.
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Check resistance – Use a multimeter to compare values against factory specs.
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Use a mechanical gauge – Screw it into the sensor port to verify actual pressure.
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Inspect wiring – Heat damage in UAE can cause cracks and false readings.
Replacement Steps
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Disconnect the battery.
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Unplug the sensor.
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Use a deep socket to remove it.
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Install a new one using a crush washer or PTFE tape.
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Torque it to 10–15 Nm.
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Clear error codes and test drive.
DIY time: 30 minutes.
Part cost: AED 50–200 depending on your car model.
Protecting Your Engine Beyond the Sensor
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Always use API SP or ACEA C3-approved oil for UAE heat.
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Replace oil filters every 10,000 km or 6 months.
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Check for leaks after every oil change.
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Consider full synthetic oil for turbocharged or high-mileage engines.
Most Reliable Pre-Owned Cars (Under AED 80,000)
| Model | Avg. UAE Price | Sensor Notes |
|---|---|---|
| Toyota Corolla Cross Hybrid | AED 75,000 | Durable Denso sensor; very few issues. |
| Nissan Kicks | AED 60,000 | Basic single-wire sensor, easy to replace. |
| Hyundai Creta | AED 70,000 | Sensors are affordable and widely available. |
| Kia Seltos | AED 65,000 | Bosch-style sensor with good longevity. |
Frequently Asked Questions
Can I drive with a faulty sensor?
Only if a mechanical gauge confirms oil pressure is normal. Otherwise, stop the car immediately.
When should I replace the sensor?
There’s no fixed interval. Replace only if it leaks or sends incorrect readings.
Is this the same as an oil level sensor?
No. The oil pressure sensor measures flow pressure, while the level sensor detects the amount of oil in the pan.
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Key Takeaways
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The oil pressure sensor is an affordable part that plays a vital role.
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Ignoring a warning light can lead to over AED 10,000 in repairs.
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Testing is quick and replacing it takes less than an hour.
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It’s your first line of defense to protect the engine—and your wallet.
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