My “Master warning light” came on
My 2021 Toyota Camry SE 130,000 I went on an hour road trip as soon as I got home the master warning light came on. It says “engine maintenance required”. I checked the coolant bypass valve on top and then the transmission one I didn’t see anything leaking. My next move is to get a OBD2 at my local auto store which one would be able to find this code and cheapest one?