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The fan runs non-stop, the air conditioning stopped switching on, or the car will not start — and the list shows relay codes. Almost always this is a

Pedal to the floor and the car barely moves, refusing to go past two thousand rpm. That is what electronic throttle protection looks like — and nine t

Everything lit up at once — check, ABS, stability — and the scanner returned codes starting with U. This is almost never fried electronics: usually a

The red oil can lit up, or the scanner returned P0521 — and you have a second to decide whether the sensor is lying or the engine really has no pressu

The automatic started jerking, hesitating before shifts or «slipping» on the motorway — and the scanner shows P0700. Here is what stands behind it and

The car has lost power, or jerks under acceleration. What a scanner shows here — and what you still have to check by hand.

Lost power, higher fuel use, and a quieter engine under load? That is what a car looks like when it can no longer hear knock.

The unit uses it to judge how much air enters the engine. It lies quietly: the car drives, but fuel use rises and power fades.

The code names the cylinder — and that is half the job done. How to tell a dead injector from a broken wire without removing anything.