Not sure which cars have them accessible. Like in silverknights case probably not an option. If it is it's own separate sensor it should be shown on a emission schematic or ecu wiring diagram. I believe all fuel injected cars have a sensor that performs this function. It may possibly be a dual function sensor. These are the names I have heard them called on schematics, there very well may be other names for them.
Will take a look and see what my fuel injection system book has in it.
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