Toyota RAV4 recurring check engine, VSC, and 4WD lights after O2 and AF sensor replacements on Toyota RAV4

Some Toyota RAV4 owners report experiencing recurring check engine, VSC, and 4WD warning lights even after replacing the O2 and AF sensors. Commonly, a loose gas cap can trigger these lights, and ensuring it is securely tightened may resolve the issue. Additionally, some owners find that even new oxygen sensors can be faulty or that other sensors in the system may be malfunctioning. Problems with the anti-lock braking system (ABS) can also lead to these warnings, necessitating a professional check of the ABS. Furthermore, emissions system concerns beyond the oxygen sensor may contribute to the persistent lights, prompting a comprehensive diagnostic check. Issues with the stability system and the four-wheel-drive system can also be responsible for these warnings, requiring thorough inspections to identify faults. In cases where the lights persist despite previous repairs, it is recommended that owners consult a qualified mechanic or dealership for a detailed diagnostic assessment.