Short answer
Sometimes they are the same light, and sometimes they aren’t. On a number of vehicles, “Service Engine Soon” is simply the manufacturer’s wording for the malfunction indicator lamp, the same warning most cars call the check engine light. On other vehicles, a “service” message is a maintenance reminder that has nothing to do with a fault. Your owner’s manual is the most reliable way to know which applies to your car.
When they are the same light
Some manufacturers use “Service Engine Soon” text or a “SERVICE ENGINE SOON” lamp for the emissions and engine fault warning. It is tied to the same onboard diagnostic system as a check engine symbol, and it stores trouble codes the same way. Nissan is often cited as an example of this wording, but wording varies by model and year, so don’t assume.
If that’s your light, treat it as a check engine light. A steady light calls for a diagnosis soon; a flashing one usually signals a misfire and is more urgent. See flashing vs. solid check engine light.
When “service” is a maintenance reminder
Some cars have a separate message, such as “Service Due,” “Maintenance Required,” or a wrench symbol, that is triggered by mileage or time intervals, such as an oil change reminder. It is not reporting a fault, and a scan tool won’t find a trouble code behind it. The usual fix is to complete the service and reset the reminder as described in the manual.
Brand practices differ, and some European makes use a service message alongside a separate engine fault symbol, so check the manual instead of relying on general rules.
How to tell which one you have
- Read the owner’s manual. The warning light section describes each symbol or message.
- Look at the symbol. An engine outline usually represents the malfunction indicator lamp. A wrench or text like “Maintenance” is more often a service reminder, though not always.
- Consider timing. A reminder tends to appear near a mileage interval. A fault light can appear at any time.
- Scan for codes. If a scan tool finds a stored trouble code, it’s a fault warning.
- Watch the behavior. Flashing is characteristic of the engine fault light.
What about “Check Emission” and other wording?
Some cars show messages such as “Check Emission System” or “Emissions System Problem.” These typically point to the emissions side of the same diagnostic system, but the wording and behavior depend on the vehicle. Treat them as a fault warning and have the codes read. An amber or orange light generally indicates something that needs attention rather than an emergency, while red generally calls for stopping safely, but confirm in your manual.
What to do when either light comes on
- Check how the car is driving and whether other warnings are lit.
- Tighten the gas cap if you recently refueled.
- If it’s a fault warning, get the code read. The steps are in why your check engine light is on and what to do first.
- If it is a maintenance reminder, check the service schedule in your manual.
FAQ
Is “service engine soon” less serious than “check engine”?
Not necessarily. If it’s the same lamp, it carries the same meaning. A separate maintenance reminder is less urgent, but you should still do the service.
Can I reset a Service Engine Soon light?
You can clear it, but if it is a fault light the problem may return. See how to reset the check engine light.
What does an orange dashboard light mean?
Amber or orange usually signals a caution that needs attention soon, but the specific symbol matters. Use the manual.