Warning lights
Reading faults and connecting the code with the vehicle symptom.
Auto electronics and diagnostics
A warning light is a clue, not a diagnosis.
Diagnostic equipment shows where to investigate. Inspection and measurement are still needed to confirm the cause.
Services and situations
What diagnostics covers
Sensors
Checking signals, power supply and sensor behaviour under real conditions.
Control units
Communication and electronic-module operation checks.
Intermittent faults
Reviewing faults that do not appear constantly and the conditions that trigger them.
What happens next
Diagnostics starts the investigation, it does not end it
Record the light and behaviour
Which light appears, when it happens and whether the car behaves differently all matter.
Stored faults are read
A code identifies an area to investigate but does not automatically prove which part failed.
Signals and wiring are checked
Sensors, power, cables and module communication are considered together.
Only then is the next step chosen
The conclusion combines the fault readout, measurements and the car's actual behaviour.
Important before visiting
Clearing a code does not repair the fault
A fault code can be the result of another issue. Wiring, signals and actual vehicle behaviour are checked before replacing a part.
Driver guides
Read before visiting
ServiceService
A dashboard light came on: what to do first
How to separate a stop warning from a reason to arrange an inspection soon.Open topic
MaintenanceMaintenance
Minor and major service: what is checked and replaced
The difference between routine work and replacements that depend on engine, mileage and history.Open topic
DiagnosticsDiagnostics