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Diagnostics

Modern cars are equipped with hundreds of sensors and electronic control units that constantly monitor how the vehicle’s systems are performing. When a warning light appears on the dashboard or the car behaves unusually (for example loss of power or rough running), professional computer diagnostics is the first and critically important step. At Carstop workshops we use modern, official diagnostic equipment that lets us read precise fault codes from the car’s memory, test components in real time and identify hidden faults before they cause expensive additional damage.

Carstop workshops include the following among their maintenance services

Scanning electronic control units and reading fault codes (DTC)
Real-time monitoring of engine and exhaust system parameters
Checking airbags (SRS), the braking system (ABS/ESP) and comfort systems
Clearing fault codes, calibrating sensors and resetting modules

How to recognise when you should bring your car in for a check

A Check Engine light or another red/yellow warning light comes on
Warning lights indicate that the car's computer has detected a deviation or fault somewhere in the system. Red lights usually point to a critical hazard (such as oil pressure or brakes), in which case you must stop driving immediately, while yellow lights warn of system faults that need prompt checking.
The engine runs unevenly, loses power, or fuel consumption has risen
Even if no light comes on, engine misfiring, poor acceleration, hard starting or a sudden rise in fuel consumption point to incorrect readings from sensors (such as the air flow meter or lambda sensor) or the fuel system — something that can only be established through diagnostics.

Read more about the service

Does clearing fault codes with a diagnostic tool also fix the car's fault?
No — clearing a fault code only erases the record of the fault, not the problem itself. If the actual fault (for example a broken sensor or wire) is not repaired, the car's computer will detect it again at the very next start or drive, and the warning light will come back on.
How often, or when, does it make sense to have diagnostics carried out?
Diagnostics should be carried out as soon as anything unusual changes in the car's behaviour or a warning light comes on. Computer diagnostics is also highly recommended before buying a used car, to uncover any hidden electronic faults and historic failures the seller may have tried to conceal.
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