These instructions apply to the MG MG3 Mk1 (SZP1) 2011-2023.
For other models, please choose your vehicle here.
After adjusting pressures or changing a wheel on your MG3 (2011–2023), you reset the tyre-pressure monitor so it relearns the correct baseline. It’s done with a dashboard button — no tool needed. A warning after a cold morning, a top-up or a wheel swap is normal and expected; the system just needs to be told what ‘correct’ now looks like.
How It Works on This Car
The MG3 stores a baseline rather than a target you type in: when you run the reset, it takes whatever pressures are in the tyres at that moment and treats them as correct. From then on it watches for a drop away from that baseline. That is why setting the pressures accurately before you reset matters — reset with a soft tyre and the car will happily accept the wrong figure as normal.
Set the Pressures First
Inflate all four tyres cold to the door-pillar / fuel-flap label figures, then reset — the system takes whatever is in the tyres at reset time as ‘correct’.
Before You Start
- Check the tyres cold — before driving, or after the car has stood a few hours, so the readings are honest.
- Set every corner to the label figure on the door pillar or fuel flap; a loaded car may take a higher pressure.
- Park up with the handbrake on before you begin the button routine.
- Only reset once you are confident every tyre is at the correct pressure — the car will store whatever it finds.
Resetting the System
- Stop the vehicle and apply the parking brake.
- Turn the ignition from position 0 to position 2 (on, engine not started).
- Press the TPMS button repeatedly until ‘TPMS malfunction’ appears on the display.
- Press and hold the button until ‘TPMS RESET’ shows with a tick.
If ‘TPMS RESET’ appears with an x, the reset didn’t take — recheck pressures and try again.
If the Light Stays On
- Recheck every tyre — one low corner triggers it.
- Always reset after inflating or a wheel swap so the baseline matches.
- Confirm you got ‘TPMS RESET’ with a tick, not an x — an x means the routine didn’t store.
- Mind a cold-morning dip — overnight cooling can push a borderline tyre under, so top up and reset again.
- A genuine slow puncture keeps the warning on — inspect before resetting.
What to Expect After
Once ‘TPMS RESET’ shows with a tick, the light clears and the new baseline is stored. It should then stay off for normal driving, only returning if a tyre loses pressure against that stored figure or you change a wheel without resetting again. If the light ever comes back after a cold night, top the affected tyre to the label figure and run the reset once more.
Frequently Asked Questions
How do I reset the tyre pressure light on an MG3?
Park, handbrake on, ignition to position 2, press the TPMS button until ‘TPMS malfunction’ shows, then hold it until ‘TPMS RESET’ with a tick. Set all four tyres to the label pressures cold first, because the system stores whatever is in them at the moment you reset.
Is a tool needed?
No — the MG3 relearns through the dashboard button. There’s no need for a workshop reader for a routine reset; the whole procedure is done from the driver’s seat with the ignition on and the engine off.
Why did it light up in cold weather?
Cold air lowers pressure; top up to the label figure and reset. Air contracts as it cools, so pressures fall overnight and a tyre near the lower limit can trip the warning. Reinflate cold to the correct figure and run the reset so the baseline matches again.
It showed ‘TPMS RESET’ with an x — what now?
The reset failed — recheck all pressures are correct and repeat the routine. An x means the system did not accept the new baseline, often because a tyre is still off or the button hold ended too early. Correct the pressures cold and run through the steps again until you get the tick.
Do I need to reset after every top-up?
Yes, if you’ve changed a pressure it’s worth resetting so the stored baseline matches. The MG3 compares against whatever it last stored, so adding air without resetting can leave it watching an old figure. Set the pressures, then run the button routine to lock in the new values.
Got a TPMS fault code rather than a low-pressure warning? Look it up on autodtcs.com. Changing the battery too? See our MG3 battery guide.
Independent guide — not affiliated with MG. Always follow your official service manual and safety precautions. Read our full disclaimer.