Toyota Supra traction and check engine lights on, unresolved after two weeks at dealership on Toyota Supra

Some Toyota Supra owners report experiencing issues indicated by the simultaneous illumination of the Trac Off and Check Engine lights, which may suggest problems with the vehicle's traction control or engine control systems. Common causes for these warning lights include ignition cylinder problems that can lead to irregular engine running, triggering the Check Engine light. Additionally, issues with the exhaust gas oxygen sensor may cause misfires during acceleration or low-speed driving, also resulting in the Check Engine light activation. A loose or faulty gas cap can disrupt fuel system pressure, contributing to the Check Engine light being on. Furthermore, the Trac Off light may appear if the traction control system is disabled due to engine misfiring, MAF sensor failure, temporary loss of traction, or ABS malfunction. If these issues persist after a dealership visit, owners are advised to seek a detailed explanation of diagnostic tests, consider a second opinion from another mechanic, and stay engaged in the repair process to ensure thorough investigation and resolution. If problems continue, escalating the matter to Toyota's customer service or consulting an automotive expert may be necessary.