Took possession of a 02 S600 from California. Check engine light came up.

What is your question?

When car was initially started no lights. Turned car off and on service engine light came on? Car cam from Cali I am in Midwest in Dec. I noticed as was mentioned by another member that temp stay around 80 but when I get into traffic, closer to 95-100. Another odd thing, took through car wash and engine died. Once I got through wash started car and turned right over? Not sure what is going on. any insight would be greatly appreciated. Car is an 02 S600 with 67k miles.