These instructions apply to the MG MG3 Mk1 (SZP1) 2011-2023.
For other models, please choose your vehicle here.
Short answer: on the MG3 Mk1 (SZP1, 2011–2023) there is no dashboard button-sequence to clear the service reminder. Both MG’s own handbook and independent workshop data are explicit that the service-interval counter has to be reset with a diagnostic tool over the OBD-II port. Here is what the job involves, what it costs at a garage versus doing it yourself, and the one reset on this car you can do without any tool.
What the Service Reminder Means
The MG3 shows a spanner symbol and a distance-to-next-service figure in the instrument message centre. The number starts at the full service interval for your market and counts down in 25-mile (50 km) steps as you drive, reaching zero when the service is due. It is a maintenance reminder, not a fault — but once the service is done the counter has to be reset, or it stays at zero.
- A spanner / “service due” symbol that stays on after a service.
- The distance-to-service readout sitting at zero.
- A reminder that reappears at every start because the last service was never reset.
Why a Diagnostic Tool Is Needed
The service interval on the MG3 is held in the instrument/body control module, and MG did not build in an owner reset sequence for it. The handbook states plainly that the service-interval information “can only be reset by an MG Authorised Repairer”, and independent workshop data carries the same note — “a diagnostic tool must be used for this operation”. There is no hidden button combination on this generation; the counter is cleared electronically over the OBD-II port. (The all-new 2024 MG3 is different — it does have a dashboard long-press reset.)
What the Job Looks Like With a Tool
On a capable tool the path is roughly Diagnosis → Service / Maintenance → Service interval reset. Menu names vary by brand of tool.
- Plug the tool into the OBD-II port (in the driver’s footwell area, under the dash).
- Ignition on, engine off, unless the tool prompts otherwise.
- Select the MG service-reset function and follow the on-screen prompts.
- The distance-to-service readout returns to the full interval once it completes.
The One Reset You Can Do Without a Tool
The MG3’s tyre-pressure (TPMS) reset is owner-doable and needs no tool: scroll the message centre to the TPMS Reset screen and press and hold the trip button for more than two seconds until “TPMS RESET” confirms. That re-learns your current pressures after inflating or a wheel change — it does not touch the service-interval counter, which still needs the tool above.
Garage Cost vs Doing It Yourself
| Option | Typical cost | Notes |
|---|---|---|
| Dealer / independent garage | About a half-hour labour charge — and usually done as part of the service itself | One-off per service. |
| DIY — MG-capable OBD service tool | A low one-off outlay | Pays for itself over a couple of services; also covers other resets. |
| DIY — multi-make diagnostic tablet | A larger one-off outlay | Worth it only if you work on several cars. |
Prices vary by region and year; treat these as a guide rather than a fixed quote.
Which kind of tool does this? (When links are live we may earn from qualifying purchases.)
An MG3 service reset needs a tool with MG service functions, not a generic code reader that only shows fault codes. The classes that do it: an MG-capable app plus a compatible OBD adapter (cheapest if you already have a phone), a standalone service-reset scanner that lists MG, or a multi-make diagnostic tablet if you service several cars. Before buying, confirm the tool explicitly lists MG service-interval reset for 2011–2023 cars.
Check It Worked
- The spanner / service symbol is gone and stays off on the next few starts.
- The distance-to-service readout shows the full interval again, not zero.
- A re-scan shows no new related fault codes.
Frequently Asked Questions
Can I reset the MG3 service light without a tool?
No. Neither MG’s handbook nor independent workshop data lists a dashboard button method for this generation — the service-interval counter is reset electronically over OBD-II. Without it, the reminder stays on.
What kind of scanner do I need for an MG3 service reset?
One with genuine MG service-reset functions, such as an MG-capable app-and-adapter or a service scanner that lists MG. A basic plug-in code reader that only reads and clears fault codes will not reset the service interval.
What does a garage charge to reset the MG3 service indicator?
Usually about a half-hour labour charge if done on its own, and often nothing extra when it is reset as part of a full service. A one-off tool purchase can work out cheaper if you service the car yourself.
Is the tyre-pressure reset the same as the service reset?
No. The TPMS reset (hold the trip button on the TPMS Reset screen) is owner-doable and only re-learns tyre pressures. The service-interval reset is a separate, tool-only operation.
Does the newer 2024 MG3 also need a tool?
No — the all-new MG3 launched in 2024 has a dashboard reset (a long press of the OK button on the Next Service screen). This tool requirement applies to the 2011–2023 car.
If a fault code is stored alongside the service light, look it up on our sister site autodtcs.com.
Independent guide — not affiliated with MG. Always follow your official service manual and safety precautions. Read our full disclaimer.