If the light is still on after the repair then you did no repair the problem you just think you did. I assume you reset the light. If not reset it and see if it comes back on. If so, you have another problem. If you retrieved the code and it pointed to, as an example, a problem with the O2 sensor, that only means the O2 sensor is being effected, and not necessarily that the sensor is bad. Any code only tells you what part is being effected not necessarily the defective part. That is where skill, knowledge, training, and diagnosis comes into play.
Have the problem that caused the check engine light to come on repaired. They will reset the light with an OBD2 scan tool. The light will just come back on if the problem is not repaired.
The Check Engine light is on because there is a problem with the emissions system. Once you have the problem repaired the light will go off.
Have the problem repaired that set the check engine light in the first place. The professional that repairs the problem will reset the light. Or, you can disconnect the negative battery cable for five minutes which may or may not reset the check engine light. However, the light will just come back on if the problem is not repaired.
If you have repaired the problem that caused the Check Engine light to come on, then you need an OBD2 scan tool to reset the light and clear the fault code from the ECU. If you have not repaired the problem then it will just come back on.
To reset the check engine light on a Hummer H3, the problem causing the check engine light should be repaired. If this does not fix the problem, the battery may need to be disconnected and re-connected.
A blinking Check Engine light indicates a serious problem with the emissions system. Have this repaired immediately.
What engine light. If you are referring to the Check Engine light then reset it with an OBD2 scan tool after the problem is repaired.
A check engine light means you have a possible problem with the emission system , you should get the Ranger scanned for trouble codes to diagnose and repair the problem . Once the problem has been repaired the check engine light can be reset.
By having the problem repaired that caused the light to come on and speed to be reduced.
If the Check Engine light is on then there is a problem with the emissions system. Once that is repaired the light can be reset. Reset it without repairing the problem and it will just come back on.
First have the problem repaired that caused the light to come on in the first place. They will reset the light.
The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, a check engine light is lit when there is a problem in the emissions or somthing that is affecting the effectiveness of the emissions.