Yes. Your Check Engine light or Service Engine Soon 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.
Yes.
No, but something that could cause uneven idle could cause the check engine light to turn on.No, but something that could cause uneven idle could cause the check engine light to turn on.
Yes
Faulty wiring.
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.
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.
IT could be a faulty transmission or the belt could be grinding up against an unknown source. = )
yes.tcc will not work corect or cruise control
Yes, a faulty O2 sensor will cause the check engine light to come on. Many auto parts stores will plug in an ODBII code reader to your Expedition to get the "trouble code" that tells you which sensor (there are 4) is faulty, free of charge.
There are numerous things that can cause a check engine light. With out knowing the code it is impossible to say.
Yes, and you would probably have a check engine light on also.