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What is a Tyre Pressure Check?

A two-minute job that improves grip, fuel economy and tyre life.

PSI32Unscrew cap • press gauge on valve • read PSI

Simplified animation — not to scale.

In plain English

Tyre pressure is the amount of air inside each tyre, measured in PSI (pounds per square inch) or bar. Manufacturers set a target pressure for your specific car — you'll find it on a sticker inside the driver's door jamb or inside the fuel filler flap, and in the handbook. Pressures should be checked when the tyres are cold (driven less than two miles).

A simple analogy

"Think of it like blood pressure for your car: too low and it labours, too high and things wear out fast."

How it works

Unscrew the black plastic dust cap on the valve stem of each tyre. Press a pressure gauge firmly onto the valve — you'll hear a brief hiss, then it'll read the current PSI. Compare to the recommended figure. If low, top up at a petrol-station air pump or home compressor. If over, press the small pin in the centre of the valve briefly to release air, then re-check. Refit the dust cap. Repeat on all four tyres — and don't forget the spare if you have one.

Signs of trouble

  • ⚠Steering feels heavy or vague
  • ⚠Fuel economy has dropped noticeably
  • ⚠Uneven wear across the tyre tread
  • ⚠Car pulls to one side
  • ⚠A tyre looks visibly flatter than the others
  • ⚠Tyre Pressure Monitoring System (TPMS) warning light on the dash
Rough UK cost

Effectively free — gauge from £5

Parts: Free at most supermarket forecourts; £0.50–£1 at petrol stations
Labour: DIY job

Always get a written quote. Prices vary by car, region, and parts brand.

Heads up: Carautonomy is for general guidance only. If your car is showing warning lights or behaving oddly, get it looked at by a qualified mechanic.

Keep exploring

Alternator
The on-board power station that keeps your battery topped up.
EGR Valve
A small valve that recycles exhaust gas to reduce emissions.
Starter Motor
The muscle that turns your engine over when you twist the key.

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A friendly note

Information here is general guidance, not a diagnosis. Always speak to a qualified mechanic before parting with cash.

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