OBD CodesWhat it means
Oil pressure keeps the moving metal parts of the engine apart. A sensor reports it to the computer and the warning lamp. Most of these codes are about the sensor circuit, but P0524 means the pressure itself is too low. Treat any of them as real until proven otherwise.
Codes in this group
| Code | Meaning |
|---|---|
| P0520 | Oil pressure sensor circuit fault |
| P0521 | Oil pressure reading out of range |
| P0522 | Oil pressure sensor signal low |
| P0523 | Oil pressure sensor signal high |
| P0524 | Engine oil pressure too low |
Bank 1 is the side of the engine that has cylinder 1. Sensor 1 is before the catalytic converter and sensor 2 is after it. More terms explained.
What you may notice
- Red oil warning light, steady or flickering
- Ticking or knocking from the engine
- Oil pressure gauge reading zero or maximum
Common causes
Most likely first:
- Low oil level
- A failed oil pressure sensor (common, and it often leaks)
- The wrong oil grade or very old oil
- A blocked oil pick-up or worn oil pump
- Worn engine bearings
What to check first
- Stop the engine as soon as it is safe if the red oil light is on
- Check the oil level on the dipstick and top up if low
- If the level is correct and the light stays on, do not drive: have the car towed and the real pressure measured
Have a mechanic confirm. A fault code tells you which system reported a problem, not which part has failed. The same code can have several causes, and they differ between car models. Use this page to understand the code, then have a qualified mechanic test the car before any part is replaced.
After the repair
Once the cause is fixed, the code can be cleared with a scan tool, or the warning light goes out by itself after several trips without the fault. Clearing a code without fixing the cause only hides it for a while. More about clearing codes.
Related codes
Engine overheating or overspeed (P0217), Fuel level sensor (P0460), Radiator cooling fan circuit (P0480), Vehicle speed sensor (P0500), Idle speed control (P0505), Brake pedal switch (P0504), Air conditioning pressure sensor (P0530), Battery and charging voltage (P0560). All codes.
Written in November 2026. These are generic OBD-II codes, the same on all makes. Causes and repair steps differ between models.