My check engine light has been on for a few weeks. At one point, I tightened the gas cap and it went away until I had to fill up with gas, then it reappeared. I thought buying a new gas cap would help, but it didnt. I took it to Auto Zone and it passed their free test. Nothing could be detected.I am at a loss.What else could be causing the problem? She still drives well. Please help!Please dont tell me about the gas cap. It‘s not the gas cap! I have replaced it and I turn it until there are 3 clicks and the check engine light is still on!
well with out the codes its hard to say buy if it went out when you tightened the gas cap then came back on later then there could be a small leak in the system and turning on the engine light.
Come on! Do your own homework.
Have the new cap tested for the proper pressure reading. Take the car to the dealership. Chances are is the new cap is bad out of the box. Put the old cap back and tighten it down. if the light go out you have your answer. You may hap to get a cap from the dealership to get the proper rated cap. Here is a question for you. Did unhook to the battery in the car for five minutes. This clears the codes out off the system that are called had codes. That stay on for more than five with the light on. Otherwise the code will pop back on from the member and turn the light back on. So tester don't read all the codes. Some test will not clear all the codes. Unhooking the power to the system will clear all the codes.
