Torque Shop

How do I know if my car's onboard diagnostics system is working properly?

When you turn the ignition, the car's "Service Engine Soon" or "Check Engine" light should flash briefly, indicating that the diagnostics system is ready to scan your vehicle for any malfunctions.

After the initial brief flash, the lights should stay off while you drive - unless the car develops a mechanical problem.

AUTOMOBILE ASSOCIATION OF SINGAPORE

www.aas.com.sg

A version of this article appeared in the print edition of The Straits Times on September 12, 2015, with the headline 'TorqueShop'. Print Edition | Subscribe