Why does my car show low tyre pressure when tyres are inflated UK?

If your UK car shows low tyre pressure warning but the tyres are properly inflated, this is usually caused by a faulty TPMS (Tyre Pressure Monitoring System) sensor or the system needing recalibration. Most modern cars like the BMW iX or Nissan Leaf require a simple reset procedure to clear the warning.

To reset the TPMS on most UK-spec vehicles: 1) Ensure all tyres are inflated to manufacturer's recommended pressure (check your manual or door jamb sticker) 2) Turn ignition to 'on' position without starting engine 3) Locate and hold the TPMS reset button (typically near steering column) until you hear a confirmation beep 4) Drive for 10-15 minutes to allow system recalibration.

There are three main types of TPMS systems used by manufacturers like Jaguar and Tesla in the UK:

1. Direct TPMS: Uses pressure sensors in each wheel (common in premium models like Range Rover)
2. Indirect TPMS: Calculates pressure via wheel speed sensors (found in many Vauxhall and Ford models)
3. Hybrid TPMS: Combines both systems for improved accuracy (used in some Mercedes and Audi vehicles)

If the warning persists after resetting, have the system checked at a qualified garage as UK MOT tests now include TPMS functionality checks. Common fault points include sensor batteries (lasting 5-7 years typically) or system wiring issues.