Engine Oil Pressure Sensor Low
The engine oil pressure sensor is reading below the normal range.
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What it means (plain English)
The engine oil pressure sensor is detecting that the oil pressure is too low, meaning there might not be enough oil circulating in the engine, which can lead to serious damage.
What the computer is actually seeing
The ECM sees a voltage reading from the oil pressure sensor below 0.5 volts or above 5 volts, interpreting this as a fault in oil pressure.
What a healthy reading looks like
Normal oil pressure should be between 20 to 70 psi, depending on engine speed and temperature. Voltage from the sensor should be around 0.5 to 4.5 volts at normal operating conditions.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the engine oil level. Ensure it is between the 'Min' and 'Max' marks on the dipstick. If low, top up with the correct oil.
- 22. With the engine running, check for oil leaks and any unusual noises indicating low oil circulation.
- 33. Connect a scan tool to confirm the SPN 1157 code is present and look for any other related codes to gather more information.
- 44. Use a multimeter to test the oil pressure sensor's voltage at the connector with the engine running. It should be within 0.5 to 4.5 volts—record the values.
- 55. If voltage is out of range, replace the oil pressure sensor. If it's within range, check the engine oil pump and filter for restrictions.
Common causes
- Low engine oil level
- Oil pump failure
- Clogged oil filter
- Worn engine bearings
- Faulty oil pressure sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, low oil pressure can lead to severe engine damage if not addressed promptly.
Will the code come back after reset?
If the issue isn't resolved—like low oil or a faulty sensor—it will likely return.
Why does this code appear with other codes?
It's common for multiple sensors to fail or show related issues if there's an underlying problem, like low oil supply.
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