A bad or failing fuel cap will not necessarily cause major performance issues, but it can set off the Check Engine Light, which will prevent the vehicle from passing an emissions test. If you suspect that your gas cap may be having an issue, have the vehicle inspected by a professional technician.
Not likely.
never mind it is a faulty gas cap
Yes. Replace the cap. Why have your car sitting beside the road because you did not put the gas cap back on when you filled up?
It means that the EVAP system senses a leak in the gas cap, or filler neck. The most common problems that cause this, are a loose gas cap, or a defective gas cap.
loose or faulty gas cap. You are losing vacuum pressure in your fuel tank and that is the most common cause.
no srry
Using contaminated fuel can cause an engine misfire which will turn on the check engine light. A faulty gas cap can for sure turn on the light.
A faulty gas cap could cause the check engine light to come on but it would not cause a rough idle or engine noises. Start with having your local auto parts store read the codes. The codes will help determine why the check engine light is on.
The most common causes of check engine light malfunction are a faulty oxygen sensor, loose or faulty gas cap, or a faulty catalytic converter. These are all easily fixed problems.
gas cap faulty
yes if the gas cap wasn't on properly then the change in pressure would set off a sensor. put the cap on right or replace it and if the check engine goes away after a few days that was your problem
The EVAP system detects a leak. Many times a loose or faulty gas cap causes that.