Can I drive with the oil light on?

No, and this is the one warning where that answer has no qualifications. Low oil pressure can seize an engine in under a minute. Stop, switch off, check the level, and if the lamp does not go out within a couple of seconds of restarting, call for recovery rather than driving it.

What is the difference between the oil pressure light and the oil level light?

The red oil can symbol is pressure and means stop now. Some cars also have a separate amber oil level warning, often the same can shape with a wavy line or the word LEVEL, which means the sump is low but pressure is still fine. Amber means top it up soon; red means stop.

Does the MOT check engine oil?

No. The MOT does not check the oil level or pressure, and there is no defect for the oil warning lamp. Since 2018 a tester will record a significant engine oil leak, but that is about what drips on the road rather than what the engine has left.

Dashboard warning light

Oil pressure warning light

Last updated 27 July 2026

Quick answer

Oil is not reaching the engine's moving parts at the pressure they need. This is the most serious lamp on any dashboard: an engine without oil pressure can seize in under a minute.

What to do: Stop as soon as it is safe
Can you drive?: No

Why it is red

Reserved for hazards and for faults where continuing could injure somebody or destroy something expensive. Most red lamps mean stop, though a few mean the opposite, so read the lamp rather than the colour.

What turns it on

A pressure switch in the oil gallery closes when pressure drops below a set threshold, typically under one bar. It reports pressure, not quantity, so it can light with plenty of oil in the sump if the pump or the pickup has failed.

What to do about it

Stop immediately and switch off. Not at the next junction, not at the next services. Every second of running without oil pressure is wear that cannot be undone.
Check the oil level on the dipstick once the car has stood for a couple of minutes.
If it is low, top up to the correct level and watch whether the lamp clears when you restart. If it does not go out within a couple of seconds, switch off again and call for recovery.
If the level is normal and the lamp is on, do not restart the engine. That points at the pump, the pickup or the bearings, and running it will finish the job.

Can you keep driving?

Nothing on a dashboard is more final than this one. An engine can be destroyed between one junction and the next, and the difference between stopping straight away and driving another mile is often the difference between a sensor and an engine. If the lamp does not clear within seconds of a restart, have it recovered.

What causes it

A genuinely low oil level, from consumption or a leak
A failed oil pressure switch or sensor, which is the cheap and lucky outcome
A worn oil pump no longer able to build pressure
A blocked pickup strainer, often from sludge on a neglected engine
Worn main or big-end bearings letting pressure bleed away
Oil thinned by fuel contamination, which is common on diesels with a history of interrupted DPF regenerations

Does it fail an MOT?

No.

The MOT does not test oil pressure, check the oil level, or record the lamp. The one related thing a tester will note is a significant engine oil leak, which has been a defect since 2018.

Fault codes that turn this light on

The lamp tells you which system reported a problem. The code stored behind it names the check that failed, which is the difference between knowing something is wrong and knowing where to look. These are the ones that commonly sit behind this symbol.

P0520Engine Oil Pressure Sensor or Switch A Circuit
P0521Engine Oil Pressure Sensor/Switch Range/Performance
P0522Engine Oil Pressure Sensor/Switch Low Voltage

Got a different code? Look it up — the index covers every standard OBD-II code.

Common questions

Can I drive with the oil light on?: No, and this is the one warning where that answer has no qualifications. Low oil pressure can seize an engine in under a minute. Stop, switch off, check the level, and if the lamp does not go out within a couple of seconds of restarting, call for recovery rather than driving it.
What is the difference between the oil pressure light and the oil level light?: The red oil can symbol is pressure and means stop now. Some cars also have a separate amber oil level warning, often the same can shape with a wavy line or the word LEVEL, which means the sump is low but pressure is still fine. Amber means top it up soon; red means stop.
Does the MOT check engine oil?: No. The MOT does not check the oil level or pressure, and there is no defect for the oil warning lamp. Since 2018 a tester will record a significant engine oil leak, but that is about what drips on the road rather than what the engine has left.

This is general guidance, not a diagnosis. Manufacturers draw the same system differently and reuse symbols for more than one function, so check the handbook for your own car before acting on anything here.

Check what your car has actually failed on

Free MOT history for any UK registration, straight from DVSA records.