As you’ve posted this in the first generation MINI section I’ll assume that you have a first generation (R50/R53) MINI. These MINIs do not use pressure sensors inside the tyres for monitoring the pressure, but use the wheel speed sensors to detect a change in rotational speed of the wheel. If your flat tyre light is on and you have no other fault indications (ABS, ASC or DSC
) then it’s probably safe to say that the wheel speed sensors are working correctly and the fault is with the tire pressure monitoring system, possibly the reset switch as you say it sticks.
From the owner’s manual, the procedure for resetting the system is:
The system must be reinitialized immediately after changing a tire and wheel, or after correcting the pressure in any tire. This requires a bit of driving.
1. Before a journey, start the engine, but do not start driving
2. Press the button long enough for the indicator lamp in the display elements to light up for a few seconds
3. Drive off.
It takes a few minutes before the Flat Tire Monitor can detect a flat tire and issue an alert.
There is also this note relating to the warning lamp:
Yellow: stop immediately
Flat Tire Monitor
The warning lamp indicates a flat tire or a system malfunction. In the event of a flat tire, an acoustic signal also sounds.
Reduce speed immediately and stop the vehicle.
It is possible that the acoustic signal was not heard. In this case, in order to determine
if there is a flat tire or a system malfunction:
1. Switch off the ignition, ignition key position 0
2. Switch the ignition back on, ignition key position 2, or start the engine.
If an acoustic signal sounds, you have a flat tire. Otherwise, the system has a malfunction or has failed.