What Does That Maintenance Reminder Light Really Mean?

A wrench. An exclamation mark in a triangle. A percentage counter. "MAINT REQD." Every manufacturer uses a different symbol for essentially the same message: the car thinks it is due for service. Here is how to read what each one actually means.

The basic categories

• Yellow wrench or service icon: Maintenance reminder. Time-based or mileage-based. Not urgent. Schedule it when convenient.
• Yellow triangle with exclamation mark: Warning, not critical. Something needs attention soon. Read your owner's manual to find which system.
• Red anything: Stop driving as soon as it is safe to do so. Red means something is wrong right now and could cause damage or be unsafe.
• Check engine light (yellow): The car has an emissions or drivability fault. If it is solid, drive to a shop. If it is flashing, pull over immediately. Flashing means active misfire that can destroy the catalytic converter in minutes.

By brand

Toyota and Lexus

"MAINT REQD" is purely a mileage-based oil change reminder. Resets every 5,000 miles. Does not actually mean the car needs anything specific.

Honda and Acura

The Maintenance Minder system uses oil life percentage and letter/number codes (A1, B16, etc.) to specify what is due. The letter is the oil-related work. The numbers are everything else. Owner's manual decodes them.

Subaru

Time and mileage based. "Service due" comes on at the manufacturer's interval. The car has no way to know what is actually wearing out, just what the calendar says.

BMW, Mercedes, Audi

Service intervals based on driving conditions, not just mileage. The car tracks your driving style, cold starts, and trip lengths to estimate actual wear on oil and other consumables. More accurate than fixed mileage. Also more expensive when ignored.

Ford and GM

Oil life monitoring with a percentage countdown, plus separate maintenance reminders for tire rotation, fluid changes, and so on. Display in the cluster shows what is due.

What to ignore versus what to act on

A maintenance reminder that comes on at exactly the mileage your manual says is just the calendar. Schedule the service in the next week or two. No drama.

A warning light that comes on early, comes on intermittently, or pops up with new symptoms (rough running, weird noise, fluid leak) is the car telling you something specific. Get it scanned. It takes us five minutes.

The reset trap

You can find videos online showing how to reset reminder lights yourself. Resetting the light without doing the service is like hitting snooze on a fire alarm. The light is not the problem. What it is reminding you about is the problem.

We reset every reminder light as part of the actual service. If the light comes back on within a few days, we want to know, because that means something else is going on.