P0520 Mercedes-Benz Code - Engine Oil Pressure Sensor/Switch Circuit Malfunction
Quick Answer
The PCM continuously monitors the engine oil pressure. Common causes include Low oil level or motor mechanical fault, Faulty Oil Pressure Sensor, Oil Pressure Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0520 Mercedes-Benz indicates Engine Oil Pressure Sensor/Switch Circuit Malfunction.
- Common causes
- Common causes include Low oil level or motor mechanical fault, Faulty Oil Pressure Sensor, Oil Pressure Sensor harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0520 Mercedes-Benz Description
What are the Possible Causes of the DTC P0520 Mercedes-Benz?
- Low oil level or motor mechanical fault
- Faulty Oil Pressure Sensor
- Oil Pressure Sensor harness is open or shorted
- Oil Pressure Sensor circuit poor electrical connection
How to Fix the DTC P0520 Mercedes-Benz?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0520 Mercedes-Benz code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0520 Mercedes-Benz code?
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Frequently Asked Questions about P0520 Mercedes-Benz Code
1. What does the OBDII code P0520 mean on a Mercedes-Benz?
P0520 indicates a malfunction in the engine oil pressure sensor/switch circuit, which monitors oil pressure and sends data to the engine control module (ECM).
2. What are the common symptoms of a P0520 code in a Mercedes-Benz?
Symptoms may include the check engine light turning on, erratic oil pressure readings, engine noise due to low oil pressure, or, in severe cases, engine stalling.
3. What causes the P0520 code to appear in a Mercedes-Benz?
Common causes include a faulty oil pressure sensor, damaged wiring or connectors in the sensor circuit, low or dirty engine oil, or a failing oil pump.
4. Can I drive my Mercedes-Benz with the P0520 code?
Driving with a P0520 code is not recommended, as it could indicate low oil pressure, which can lead to severe engine damage if ignored.
5. How do I fix the P0520 code on my Mercedes-Benz?
Repairs may involve replacing the faulty oil pressure sensor, repairing damaged wiring, ensuring the engine has clean, sufficient oil, or addressing issues with the oil pump.
6. How can I diagnose the P0520 code in my Mercedes-Benz?
Use an OBDII scanner to confirm the code, inspect the oil pressure sensor and its wiring for damage, check the oil level and condition, and test the oil pressure with a mechanical gauge.
7. How much does it cost to repair a P0520 code on a Mercedes-Benz?
Costs can vary but typically range from $100 to $300 for parts and labor if replacing the oil pressure sensor. Additional repairs, such as fixing wiring or replacing the oil pump, may increase costs.
8. Can the P0520 code be caused by dirty engine oil?
Yes, dirty or degraded engine oil can lead to incorrect oil pressure readings, potentially triggering the P0520 code.
9. Will resetting the P0520 code fix the problem in a Mercedes-Benz?
Resetting the code will clear it temporarily, but if the underlying issue isn’t resolved, the code is likely to reappear.
10. How often should the oil pressure sensor be replaced to avoid a P0520 code?
Oil pressure sensors don’t have a fixed replacement interval but should be inspected and replaced as needed, especially if there are signs of malfunction or oil leaks.
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