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Home/DTC Codes/Mazda/CX-3/2016-2021 2.0L I4/P0521
P0521

Engine Oil Pressure Sensor/Switch Range/Performance

2016-2021 Mazda CX-3 2.0L I4 🇩🇪

High SeverityPowertrain

Description

Oil pressure sensor reading is out of expected range.

Symptoms

  • Oil pressure gauge erratic
  • Warning light flickering

Common Causes

  • Sensor fault
  • Oil pressure fluctuating
  • Worn oil pump
  • Wrong viscosity oil

Diagnostic Steps

  1. Test with mechanical gauge
  2. Check oil level and condition
  3. Test sensor
  4. Verify correct oil viscosity

Repair Notes

Verify actual pressure. Replace sensor if pressure is good.

Related Codes

P0520Engine Oil Pressure Sensor/Switch CircuitP0522Engine Oil Pressure Sensor/Switch Low Input

Other Powertrain Codes

P0521 on Other Vehicles

Mazda 626

1993-1997 2.0L I4

Mazda 626

1993-1997 2.5L V6

Mazda 626

1998-2002 2.0L I4

Mazda 626

1998-2002 2.5L V6

Mazda Axela

2013-2019 1.5L I4 P5-VPS

Mazda Axela

2013-2019 2.2L I4 Diesel SH-VPTS

Mazda B2300

1994-1997 2.3L I4

Mazda B2300

2002-2009 2.3L I4

Common Questions

What does code P0521 mean on a 2016-2021 Mazda CX-3?

P0521 stands for "Engine Oil Pressure Sensor/Switch Range/Performance". Oil pressure sensor reading is out of expected range.

What are the symptoms of P0521 on a Mazda CX-3?

Common symptoms of P0521 include: Oil pressure gauge erratic, Warning light flickering.

What causes P0521 on a 2016-2021 Mazda CX-3?

Common causes of P0521 include: Sensor fault, Oil pressure fluctuating, Worn oil pump, Wrong viscosity oil.

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