Question 1

What do the colors of dashboard warning lights mean?

Accepted Answer

They follow a traffic-light logic: red means stop as soon as it is safe (oil pressure, overheating, brake faults), amber/yellow means service soon (check engine, tire pressure, ABS), and green or blue are simply informational confirmations that a system is on (high beams, cruise control, fog lights).

Question 2

Is it safe to drive with an amber warning light on?

Accepted Answer

Usually for a short, careful drive to a mechanic — amber means a fault needs attention but is not immediately dangerous. The exceptions are a flashing check engine light (active misfire; stop soon) and any amber light paired with symptoms like rough running, loss of power, or strange noises.

Question 3

Why do all the lights come on when I start the car?

Accepted Answer

That is the bulb check: the cluster lights every symbol briefly at key-on so you can confirm the indicators work. They should all go out within a few seconds. Any light that stays on after startup is reporting a real condition.

Question 4

Can I read why a warning light is on myself?

Accepted Answer

Yes — an inexpensive OBD-II scanner (under $30, or free scans at many parts stores) plugs into the port under the dashboard and reads the stored fault codes for engine, emissions, and often ABS/airbag systems. Codes tell you the circuit at fault, which narrows the cause before you spend anything.

Car warning lights, decoded

Frequently asked questions