Scion xD check engine and traction control lights illuminated on Scion xD

Some Scion xD owners report experiencing issues when the check engine light and traction control lights illuminate, which can indicate various underlying problems. These issues may include the traction control system being turned off, engine misfiring, MAF sensor failure, temporary loss of traction, or an Anti-lock Braking System (ABS) malfunction. The check engine light typically signals a problem with the engine or emissions system, while the traction control light indicates that the traction control system is active to prevent wheel spin on slippery surfaces. After addressing the root cause of the check engine light, some owners find it necessary to reset the light by disconnecting and reconnecting the battery. It is important to note that the check engine light can be linked to emission system issues as well as problems in the ignition system, engine timing system, and transmission, making it crucial to treat the codes as part of a comprehensive diagnostic process. Additionally, specific trouble codes can be accessed using an ECM Code Reader to identify the exact issues.