A lot of modern cars can appear to be ‘running just fine’ but underneath the covers it’s pulled timing, altered fuel trims, etc. to appear normal and/or avoid damage but the computer stills knows that’s not a normal situation and alerts you to the problem. Unless you hook a scanner up and actually find out what the idiot light I telling you then you can’t be sure if it’s a false positive or not.
A lot of modern cars can appear to be ‘running just fine’ but underneath the covers it’s pulled timing, altered fuel trims, etc. to appear normal and/or avoid damage but the computer stills knows that’s not a normal situation and alerts you to the problem. Unless you hook a scanner up and actually find out what the idiot light I telling you then you can’t be sure if it’s a false positive or not.