Yes, changing your tire size will affect the fuel economy of your car or truck or suv. The OBD Computer will sence the change and register it as a fault, thus turning on your check engine light.
The check engine light (service engine soon) 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.
Yes it will
No
No, oil level does not cause the check engine light.
Yes, an unplugged sensor can cause a check engine light.
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.
The check engine light is causes by an emission system failure. If the cause of the code has been repaired, the code can be cleared with a scan tool.
Yes, water can cause a misfire, which will cause the check engine light to flash.
The check engine light is reset with a scan tool after repairing the cause of the fault.The check engine light is reset with a scan tool after repairing the cause of the fault.
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.
Assuming you want to clear/reset the check engine light, if you have successfully made repairs to correct what was the cause of the check engine light to go on the light will clear itself after a few drive cycles.
It really depends on what the cause of the check engine light is.
no a burnt out headlight will not cause a check engine light but if you go to most of the part places they will check the check engine light for free