The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.
That is the check engine light. Looks like a picture of an engine.
There are pages of causes, you need to have it checked for codes.
That depends entirely on the reason why the check engine light is on.
i just changed my batterys out on my truck now my check engine light is on?
Check for a good ground between the engine and the body. Also check the light grounds.
There are approx. four pages of codes, you need to have checked with a scanne to see which set.
Check engine light Low power Poor fuel economy
No. It is illegal, the check engine light will be on, and the computer will try to adjust which will hurt performance.
That requires a scan tool.
ODO
No
The dipstick is on the passenger side of the truck, near the bottom of the engine and close to the firewall.