If the warning lamps do not indicate a safety system failure such as an engine or fuel injection system malfunction, continuing to drive the vehicle with a faulty system and no warning can increase the risk of a crash or injury.

The Engine Control Unit (ECU) software may erase trouble codes after the ignition is turned off, not illuminating warning lamps and preventing drivers from being warned of safety system problems the next time that they are driving.

What to do: Book it in at your next service. There is no deadline and no charge.