Toyota Highlander recurring check engine and AWD light activation, possibly related to fuel quality on Toyota Highlander

Some Toyota Highlander owners report experiencing recurring activation of the check engine light and the AWD system warning light, which may indicate various underlying issues, potentially related to fuel quality. These warning lights typically illuminate when the onboard diagnostic system detects problems with the engine or emissions system, while the Check AWD System alert suggests possible issues with the All-Wheel Drive system, leading to traction and handling problems. Owners have noted that these warnings can arise from sensor malfunctions, component damage, or computer system failures within the AWD system. It is crucial to address these warning lights promptly, as neglecting the issue could lead to more serious problems and costly repairs. Additionally, when both warning lights appear simultaneously, the situation may require thorough diagnostics to identify the root cause. Therefore, it is advisable for owners experiencing these issues to have their vehicle inspected by a qualified mechanic.