Engine Oil Pressure Sensor/Switch A High

Where it lives

For P0523, the part to look at first is the sensor named here.

Check these first

• Open or short-to-voltage sensor wiring
• Faulty oil pressure sensor
• Corroded connector
• PCM signal circuit fault

What to do next

1. Confirm actual pressure with a mechanical gauge
2. Check the sensor signal circuit for short to voltage
3. Inspect the connector and wiring
4. Replace the sensor if it reads high against a known gauge
5. Repair wiring and clear the code

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