Multi-code OBD2 diagnosis
Enter all the codes your scanner showed, not just the first one. We give you the overall severity, whether you can keep driving, the order in which to check them and how they relate to each other.
Summary
- Overall severity
- High
- Can I keep driving?
- Yes, but with caution
- Estimated cost
- $20 to $250
- Codes analyzed
- 1 of 1
The order below is the recommended one: first the codes that can cause the others. After each repair, clear the codes and check which ones come back.
Order of inspection
P0521 Engine Oil Pressure Sensor/Switch Circuit Range/Performance High
The P0521 code means the oil pressure sensor or switch gives a reading that is electrically valid but does not match what the computer expects. The oil pressure reading cannot be trusted. Check the oil level and confirm the real pressure with a mechanical gauge before you blame the sensor.