Lexus CT200h Check Hybrid System Light Activated After Battery Replacement on Lexus CT200h

Some Lexus CT200h owners report experiencing the "Check Hybrid System" light activating after a battery replacement, which may require a dashboard reset. If the warning light remains on, it could indicate a fault in the hybrid system or the battery itself. Some users have noted that the light reappeared after replacing the 12V auxiliary battery, suggesting the issue might not be linked to the hybrid cells' health. In certain cases, dealerships have recommended costly hybrid battery replacements. Additionally, one owner found that the warning was caused by a faulty EGR Valve, which was covered under Lexus Warranty Policy. Owners are advised to check for clogs in the rear passenger seat vent fan, as this could also trigger the warning. It is crucial to monitor the situation after resetting the dashboard, seek a thorough diagnosis if the light persists, and be prepared for potential repairs, including hybrid battery replacement. Prompt attention to the "Check Hybrid System" light is essential for the continued smooth operation of the Lexus CT200h.