Real diagnostic cases

Practise like in the workshop: symptoms, DTCs, live data and a confirmed root cause.

All beginner intermediate advanced

The engine cranks slowly in the morning. The customer reports the battery has been replaced twice and the problem returns within a...

The engine turns over at normal speed but does not fire. The customer ran out of fuel last week.

Rough idle, occasional hesitation and a check engine light. Fuel consumption has increased slightly.

The battery warning light glows faintly and the lights dim at idle. It improves when revved.

Temperature rises in slow traffic and returns to normal on the open road. The coolant level drops slowly.

The air conditioning blows cold when driving but warm when the car is stationary in traffic. The compressor clutch engages normall...