If the engine warning light is on after a head gasket replacement, it could indicate an issue with the installation, such as a vacuum leak, improper timing, or a sensor that was disturbed during the process. Check for any vacuum hoses that might have been disconnected or damaged. Additionally, ensure that the timing is correctly set and that all electrical connections are secure. If the problem persists, it may be worth rechecking the head gasket installation and looking for any underlying issues that the diagnostic test might have missed.
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