You get a light but you don't get a code.
Edit:
That's [if] there is a path to ground. Removed, you get nothing.
There's no fail-safe that says, "Idiot, you don't have a sensor".
Edit:
That's [if] there is a path to ground. Removed, you get nothing.
There's no fail-safe that says, "Idiot, you don't have a sensor".