Lexus Troubleshooting Questions? Ask a Lexus Expert
Hello. Welcome to Just Answer. Please allow me to assist you. While the gas cap is the most common cause of the Check Engine Light coming on, it is only one possibility of at least 100 different issues. The solution to this issue is through diagnosis. The check engine light comes on for a reason. The reason that the light comes on is because there is a problem in one of the electrical circuits or the sensors. When the light is on, a 'code' is stored. The way to obtain the code is via a scan. Most auto parts stores offer this service for free (so they can sell you their parts). The results of the scan will indicate exactly what circuit or sensor is involved. If you can get the code (or codes), the solution is usually easy to arrive at. Indiscriminate replacement of parts can and will be expensive, and installing said parts may not fix the problem. The recommendation on thsi request is in two parts. 1) get the car scanned, and provide the results back into this chat window and, 2) once we have the code(s) we can direct you in the correct method to eliminating the issue.