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Most states except California and Virginia most auto parts stores do free malfunction code reads. Can you swing by there and have them run a scan test to see if there are codes set in the computer? Without the code numbers it's very difficult to tell you what could be going on.
That is extremely unlikely. Whenever a check engine light illuminates it sets a code in the history portion of the computer unless you've driven it more than 30 key cycles it would stay in the history. It's possible that there scan tool is not reading the data properly from the computer. Even if the check engine light goes out like I said again unless you're driving it more than 30 times it should still be stored in history. Have you tried a different place to have the codes read even if the lights off? Can you get a code reader from the local parts store usually you can buy one for less than $60 and plug-and-play and check the codes when the lights on? Without that code number it's hard for me to tell you what could be going on.
Hello and welcome to just answer. I value your questions so I an help you better. The previous expert was bang on with his answer As I am a Toyota master tech myself and can assure you if that engine light has come on there will be a code stored in one of three categories , current, history or pending . Obviously who ever is trying to read codes is not very well versed in this. So if you want to have help with your issue we would be happy to assist you but if you want to go down that path it's your decision but could be a costly one L;et me know .