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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.

The car jerks pulling away, the revs live their own life, the pedal answers late. One reading on screen tells whether the throttle is to blame.

The car jerks under load and dies on a climb. How to tell a tired pump from a blocked filter and from the sensor simply lying.

P0420 is not a death sentence. What kills a catalyst, how to tell a dead one from a wrongly blamed one, and what actually follows a «delete».

The decision is made in a minute at the roadside. In order: what means stop now, what means you can get home, and what means nothing happened at all.