Live data

A penny sensor that can quietly ruin both starting and fuel consumption. It takes ten seconds and no tools to check — just compare two numbers in the

Cruise control stopped engaging, the speedometer froze or jumps, and the gearbox started shifting at the wrong moments. All of it is one sensor — or o

The car starts every other time, the battery lamp flickers, and the list shows voltage and alternator codes. Here is how to tell a dead battery from a

These codes do not merely say «the mixture is wrong» — they say where and when: at idle or under revs, on bank one or bank two. That detail cuts the s

The same socket, but less data than people expect. Honestly: what reads, what does not, and why the battery's health is not checked this way.

A diesel has its own codes, its own live data and its own order of checks. Half the familiar petrol habits simply do not apply.

Plugs die gradually and the car gets used to it. Here is what the numbers show before you feel anything.

The car would not start this morning. Three voltage readings say which one to replace — and they cost nothing.

The car got worse after a fill-up. Here is how to tell bad fuel from coincidence.

High revs on start-up, white vapour, higher consumption — all normal. Here is what is not.

Two numbers that show what the unit thinks of the mixture. They find an air leak before the lamp comes on.

Sixty-seven parameters is a lot. Here are five that answer most questions about how the engine feels.