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Misfires, rough idle and poor economy can all start at the plug. Copper plugs last around 20,000 miles; iridium plugs up to 60,000. Rough idle or hesitationHard starting on cold morningsFalling fuel e

Steady or flashing, and when it's safe to keep driving. A steady light means a fault has been stored. A flashing light means a misfire that can damage the catalytic converter — slow down and get

Under-inflated tyres wear faster, grip less and burn more fuel. Check pressures once a month and before long trips, with the tyres cold. Find the figure inside the driver's door or fuel flapAdd 2

AGM, EFB or standard — and why start-stop cars need the right one. Fitting the wrong battery type to a start-stop car can kill it within months. AGM: for cars with regenerative braking and start-stopE

Service intervals, short journeys and why 'long-life' isn't always long. Most modern cars specify 10,000–20,000 miles or once a year. But short trips, towing and city driving count as &