Tyre pressure (TPMS) warning light on

A warning shaped like a tyre cross-section, often with an exclamation mark, comes on the dashboard, sometimes with a per-wheel pressure display. This is the tyre pressure monitoring system (TPMS): a small electronic sensor built into each valve or fixed to the rim continuously measures the pressure (and sometimes the temperature) and sends the data by radio to a receiver unit. On motorcycles this system isn't yet mandatory as it is on cars, but it increasingly equips premium road, adventure and touring models from the factory, and universal kits exist for older bikes. The light can signal two very different things, absolutely not to be confused: either a real pressure problem (progressive under-inflation, a slow puncture, a valve leak) which directly concerns safety and must be checked immediately with a gauge; or a problem with the system itself (an electronic sensor at end of life, unpaired after a tyre or wheel change, or simply out of sync), in which case the actual tyre pressure is fine. You tell them apart in three steps: measure the actual pressure with a gauge (the only judge, never the dashboard screen), see whether the displayed values are consistent or clearly aberrant (dashes, zero, jumping values), and recall whether a wheel, tyre or battery was changed recently. Urgency threshold: if the pressure measured with a gauge is really low, treat it like any under-inflation — it's a safety point (grip, handling, tyre overheating) to correct before riding normally. If the actual pressure is fine, the light comes from the sensor or its pairing: annoying, but not dangerous in the immediate term.