need help! clicking noise 20 sec after start

[tdj125]

i have a 05 ford freestyle se 2wd, when you start the car all is good for about 20 sec, then you hear a click noise like something just turned on. Now when this happens, the wrench light comes on, the traction control light comes on, and the rpms go up slightly, followed by the electric fans that run at full blast even after being unplugged from temperature sensor. Its like when this happens, the car goes into limp mood. and every time the codes are checked it says( sensor reference voltage A circuit open) Can someone please help me with this issues!

[RVAFreestyle]

First step is to pull diagnostic trouble codes from the vehicle. If you don't have a scan tool, go to your local autoparts store and buy the best one you can afford or take the care there to have them pull it.

Ideally you need a scan tool that at the bare minimum can read I/M readiness codes and live ECM data. No just a simple code reader.

Have you performed any work on the car recently before this occurred? or had any work done by someone else?

[tdj125]

The code is p0641 sensor reference voltage A circuit open. No I have not worked on it at all just bought it for my daughter 2months ago from auction.

[ds32928]

A quick internet search found this, among many other links. Could be a rubbing harness. Find a local repair shop that can put the vehicle up on a lift and look for that, and dirty harness connectors? Are you someplace with snow and slop on the road?

https://www.troublecodes.net/pcodes/p0641/

[tdj125]

No I live in south Carolina, I have been searching all the wires for the last month. Changed all sensors, throttle body, even changed radio but still just static like there is some kind of interference some wherr

[tdj125]

What sensors are ran off of circuit A?