Yes, a defective fuel cap will make the check engine light come on. It will alert the car that its not getting good gas mileage.
Some of the factors that caused the "check engine" light are: defective oxygen sensors defective air mass meter emmission systems Hope this will help
A defective thermostat can cause the engine to overheat. It can also cause the engine to not reach full operating temperature if the thermostat is stuck open. It is possible this could set the check engine light.
No, but a defective fuel cap can set the "check engine" light to come on.
A clogged or defective fuel filter will very likely cause a check engine light. If it is suspected, it should be replaced.
No. Use a code scanner to find out why the check engine light is on. You can borrow, rent or buy a code scanner from most auto parts retailers.
Yes it can.
Bad gas, water in fuel, Low fuel pump pressure, dirty air flow sensor screen, one or more engine sensors defective and/or out of normal reporting ranges, engine control computer defective. Low battery and alternator output. The "check engine light"should have come on to give you a hint.
No, low gas cannot cause a Check Engine light to turn on. There would have to be a problem within the engine or the engine wiring for that light to come on.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Engine missfire. Cylinder #4
IF the computer was really defective, either the car would not run, or there would be a check engine light due to a fault code.
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.