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If your vehicle has this fault and you’re not comfortable diagnosing this issue at home, we recommend finding a RepairPal certified shop nearby to pinpoint the problem and give an accurate estimate for repairs. With an oil pressure sensor fault, the first step is to get it diagnosed to figure out what is causing the problem. Engine coolant temperature sensor is not operating correctly.There are many potential causes of code P0521. This code can also be set when the engine detects constant fluctuation of the oil pressure value. The P0521 code is set when the ECM detects the voltage value is either higher or lower than the specified acceptable range of oil pressure. This is then communicated to the ECM in the form of a voltage value. The oil pressure sensor calculates the oil pressure of the vehicle’s engine. It is recommended to take your vehicle to the nearest dealership as soon as possible to have this code properly repaired to avoid costly engine repair(s). However, if not addressed early on, this code can cause serious internal damage to your engine causing complete engine failure. Diagnosis: Initially, this trouble code will not stop your vehicle from operating normally.Repair Urgency: Fix this code immediately (same day if possible) to avoid internal engine damage.Issue Severity: SEVERE – Stop driving immediately.P0521 definition : Engine Oil Pressure Sensor/Switch Range/Performance.
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