I have a 2001 Ford F-150 v6 2wd. A few weeks ago, the check engine light turned on so I drove to the nearest autozone to hook up their computer and see what the error code was. The technician gave me the code (I don’t remember it off the top of my head but it wasn’t something imminent). Before leaving, I asked him if he could clear the light, figuring that if it didn’t come back on after 50 miles, that it might have just been a fluke with one of the truck’s sensors. Later that day, I realized that when I started the truck, the check engine light was no longer turning on momentarily the way that all the dashboard lights do to tell you that they’re working.
I went back to a different autozone (one closer to my house) and explained the situation. They checked the computer for codes again and found none and said that the light must not be turning on because the bulb is burned out. I find this to be a striking coincidence that the bulb should happen to blow out exactly when the technician used his computer to clear the light. Is it possible that he did something with his computer that permanently disabled the check engine light? It’s been a few weeks and I’ve since bought an inexpensive bluetooth code reader of my own, hooked it up, and found that there is still no active code. Is it possible that the code has returned or will return, but that I won’t have a way to know because something he did supressed not just the light but my car’s code reporting mechanism?
For now, the truck drives fine, but I’m afraid to travel long distances when there might be a problem I don’t know about.
I’ve searched the web but could not find answers to these specific questions.
Thank you for your help!