Which light do you have?
Service reminders are usually amber or white text messages or simple symbols that appear around the time an oil change is due. Fault warnings are triggered by sensors and mean something needs diagnosing. If you aren’t sure which you’re looking at, check the dashboard lights section of your owner’s manual before you assume it’s just a reminder.
Brand-specific guides:
- Toyota MAINT REQD light — what it means and how to reset it
- Honda Maintenance Minder codes — A1, B1, B12 and the rest
Two kinds of reminder: counters and calculators
Mileage counters simply count the miles since someone last reset them, then light up at a set distance. Toyota’s MAINT REQD light works like this on many models. The car doesn’t know whether the oil was actually changed — only that the counter was reset.
Oil-life calculators, used by Honda, GM and others, estimate how worn the oil is from engine temperature, speed, trip length and other data, and show the remaining life as a percentage. They adjust to how you drive.
Either way, the reminder doesn’t replace the time limit in your schedule. A car that’s rarely driven may need service before the light ever comes on. See mileage versus time.
What to do when it comes on
- Confirm it’s a reminder, not a fault light, using the table above or your manual.
- Look up what’s due. It’s usually an oil change, often with a tire rotation; your schedule may add more at certain mileages. See how often to change oil.
- Book the service within the next few hundred miles or weeks.
- After the work, make sure the reminder is reset — shops normally do this — and keep the receipt.
Should you reset it yourself?
Only after the service has actually been done. Resetting the light without the work hides the reminder until the counter runs out again — the oil keeps ageing either way. The reset steps differ by model and are in your owner’s manual; for Toyotas, see our MAINT REQD reset guide.
If you change your own oil, reset the reminder and record the date and odometer reading so your history stays complete. Our maintenance records guide shows what to keep.
Common questions
Is it safe to drive with the maintenance required light on?
Generally yes, for a short while — it’s a reminder. Don’t ignore it for months, and make sure it isn’t actually a fault or oil pressure light.
The light came on right after an oil change. Why?
Most likely the reminder wasn’t reset after the service. Ask the shop, or reset it using the steps in your manual.
What does “Service engine soon” mean?
On many older cars, including some Nissan and GM models, “Service engine soon” was the wording for the check engine light — it means the engine computer has found a fault, not that an oil change is due. Have the code read.