What To Do When Your Engine Warning Light Comes On

Solid versus flashing — the key difference

If your engine warning light (check engine light) is solid, the car is usually safe to drive — a fault has been detected but it is not causing immediate damage. If it is flashing, stop driving immediately and call for recovery. A flashing light means the engine is misfiring or running dangerously rough, and continued driving risks serious damage.

Common causes

A solid warning light often points to: a loose fuel cap (check this first — it may clear the light), faulty oxygen sensor, catalytic converter issue, misfire, or EGR valve fault. None of these are instantly dangerous, but all need diagnosis and repair within a few days.

What we do when you bring it in

We use professional diagnostic equipment to read the fault code from your engine computer. This tells us the exact system triggering the light. We then run live data tests to confirm whether it is a sensor fault, a wiring issue, or a real mechanical problem. This diagnosis takes less than an hour and gives you a clear picture of what needs fixing — no guesswork, no blind parts-swapping.

Once we know the fault, we give you a written quote before touching anything. You approve the fix, we carry out the work, clear the fault code, and road-test to confirm the light stays off.

Cost to diagnose?

Diagnostic testing starts at a fixed price for code read and live data checks. Call us on 0121 476 2287 for a quote. If you go ahead with repairs, we deduct most of the diagnosis cost from the repair bill.