VSC and Check Engine light came on this morning when I started my ES350. So I checked the gas cap and it was opened, so most likely I didn't tightened it well after putting in the gas yesterday.
After I tightened the gas cap and started the car again, both lights are still on. I drove around the neighborhood and the car feels normal (no vibration) to me, but the lights remained on. Do I need to drive the car a few rounds to reset the light? But I also worry about something else aside from the gas cap is wrong. Any suggestion?
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its usually the gas cap or the oxygen sensor or maybe even fuel sensor. Replace the gas cap first and unplug your battery. this will reset all warnings (can take up to 1.5 tanks for any engine light to re-trigger)
A simple suggestion here is for anyone to go out and buy a code scanner. You can get one for $30-$60 and make sure it has an "erase" function. When you get a CEL just plug in the scanner under the dash at the OBDII connector and read the code. Write it down and then erase it. If it comes back see the dealer or a repair shop.