Check engine light comes on very frequently. Each time the dealer tells a different answer and it cost about 40$ each time. Extended warranty doesn't cover it. Even after the gas cap is turned tight, the problem exists. Sometimes it goes off automatically after driving about 1/2 tank. But I don't know whether I am spoiling car by doing that.
Little bit more description in the manual about frequently occurring problems and preventive measures would be appreciated.
The Check Engine Light is because the gas cap is too tight, not because it is too loose.