The F3 code means that the sensor circuit is opening
up. Now the sensor could be a dud however the first
thing I would want to look at are all sensor connections
including where it connects at the Electronic (or ERC)
control. In the past Ive had a good share of trouble with the
plug that the sensor itself plugs into wire harness. The best way to
handle this is to cut the plug from both the sensor and
the range harness and connect the wires directly together with
high temperature ceramic wire nuts. Next inspect the sensor wiring
and make sure that the plug at the ERC control is making good
connection. If the sensor, the wiring and “all” of the connections
are up to snuff then chances are there is a problem with the ERC
control itself.