heat, primarily. either causing degausing of the permanant magnet behind the sensor, or other thermal damage to the hall ic itself.
Yes, that is usually where the rpm signal comes from.
The sensor is a hall effect sensor. Measuring resistance will not indicate a "pass/fail". You must test voltage of the sensor while cranking engine. You should see voltage change from 0.0v to 5.0v or see 2.5v on meters that have an averaging function.
there are usually no symptoms for oxygen sensors if there lean or something. But i f other sensors fail like crankshaft sensor of MAF sensor u will notice drivability problems Sometimes you will get a check engine light.
Carbon build up on filiment inside sensor. Spray with Mass airflow cleaner or carb cleaner.
Overheating from the engine wears down the sensor and will go out when it gets to hot , after awhile it could be completely degraded to where it wont work anymore
I had mine fail on a 92 Park Avenue. Only a Buick dealer had the tools to replace it. A special pulley puller is needed to do that on mine. It cost about $300 if I remember correctly.
The same reason the space shuttle blew up----just because mine also failed at 46,000 they only took bout an hour to change both
Check your instrument cluster fuse in the main fuse box.
There could easily be a loose connection or some electrical component that is starting to fail. Run a test of the computer codes, to see if a problem shows. Check the connection on the crankshaft sensor.
Does the camshaft position sensor drive the oil pump on a 99 ford tauraus 3.0 engine? Ford Taurus: 3.0 liter 12 valve engine, 1997 - 2006. The shaft that is used to rotate the camshaft position sensor also rotates the oil pump. The shaft is driven by a worm gear on the camshaft. The position sensor end of the shaft can fail and poor engine performance results, if the entire shaft quits rotating because of a gear failure the oil pump quits rotating (pumping) and the resulting lack of engine lubrication causes the crankshaft bearings to fail and the engine will stop (permanently) within seconds.
It may have been thumped by a irate customer, there is a shock sensor which will cause the firmware and encryption data to be dumped when this sensor is triggered. also keys can fail probably due to water and or dirt ingress.
you can fail