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Diagnostics

Check engine light on: what it means

Diagnostics for an engine warning light, including stored faults and the systems related to the symptoms you have noticed.

Driver controls and dashboard in a premium car interior

The engine light comes on when the engine computer sees a value outside its limits. The fault code tells us where to look; tests tell us what is actually wrong.

Common causes

  • Ignition coils or spark plugs
  • Oxygen or air mass sensors
  • Vacuum or boost leaks
  • Emission control faults

What to do

A steady light: book a diagnosis within a few days. A flashing light or loss of power: reduce speed, avoid hard acceleration and call us.

Questions and answers

Is it safe to drive with the light on?

If it is steady and the car drives normally, book a check soon. If it flashes, slow down and stop: a flashing light usually means misfires that can damage the catalytic converter.

Will clearing the code fix the problem?

No. The code only points to where the fault was found. Testing the system finds the cause, and the repair fixes it.

Related symptoms

  • Loss of power

    Diagnostics for changes in acceleration, engine response or reduced-power warnings, based on the symptoms and recorded faults.

  • Warning lights

    Inspection and diagnostics for dashboard warnings. A photo of the warning helps us arrange the appropriate checks.

Related services

  • Engine components during a rebuild at 1000 Dunes Garage

    Engine repair

    Engine diagnostics and repair for oil leaks, overheating, timing faults and changes in performance.

One Thousand Dunes Garage

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