Check engine light: what you need to know

What should you do if your check engine light suddenly comes on, but your engine doesn’t seem to be having any trouble? Answer the following questions to determine how much you know about this warning light.

1. The check engine light usually indicates that you must get to a repair shop immediately.
   • a) True
   • b) False
2. Which one of these faults is NOT a common cause of the check engine light coming on?
   • a) The operation of a mechanical part is affected by humidity
   • b) The gas cap isn’t closed all the way
   • c) The engine is about to break down
3. What is the name of the socket fitted under the steering wheel of a car that an auto mechanic uses to perform an initial engine examination when the warning light comes on?
   • a) ODL
   • b) OBD
   • c) R2D

Answers

1. b) The check engine light typically comes on to let you know a fault has been detected in your engine and requires attention. This isn’t usually cause for immediate concern. However, if the light is flashing, it’s an emergency. Go to a repair shop without delay, or pull over and call a tow truck.
2. c) Your car’s engine may fail shortly after the check engine light comes on, but this is rare. In most cases, it may simply be that the fuel cap isn’t closed properly, excess moisture in specific components, a leak affecting the exhaust system or a loose wire causing an open circuit.
3. b) Since 1996, vehicles have been fitted with an On-Board Diagnostics (OBD) socket (now second generation). A reader plugs into this socket to identify the source of the fault.

No matter the source of the problem, it’s important not to panic. Remember that acting sooner rather than later is essential, even if it’s not an emergency. Has your check engine light come on, and do you need professional help? Make an appointment at your nearest M 360 Mechanic.