I believe the manuals will say 100,000 miles, but I only change them when they generate an error. If your check engine light is on, a DLC reader (Which you can "borrow" from most part stores) will show what errors or registered, and the O2 sensor is a common one on older cars.
The 1981 Ford Crown Victoria does not have an Oxygen sensor.
Where are the Bank 1 Sensor 1 oxygen sensor on a 1998 ford explorer?
Remove the vacuum hose from the oxygen sensor. Remove the oxygen sensor retaining screws. Reverse the process to install the new oxygen sensor.
The 1996 Ford Taurus heated oxygen sensor can be found behind the dashboard on the passenger side of the passenger compartment. The oxygen sensor should be labeled as such.
First, change the oxygen sensor and the air filter. Clear the codes and see if the idler air sensor code comes back.
Near the starter on the exhaust header. If it is 1990 it will be fun to break the rusty sensor out of the truck. good luck
The 1997 Ford Aerostar oxygen sensor is screwed into the exhaust pipe. It is about even with the rear of the oil pan.
A 2000 Ford Focus oxygen sensor diagram can be obtained from most Ford dealerships. The diagram can also be found in most Ford repair manuals.
To replace the oxygen sensor disconnect the oxygen sensor electrical connector. Use an oxygen sensor socket to remove the sensor. spray the sensor with penetration oil if it is difficult to loosen. install in reverse.
It has ( one oxygen sensor ) on the 1991 and 1992 Ford Explorers
unplug from loom, get big spanner and unscrew from exhaust. refit in reverse
motorcraft . com just shows ( 1 ) oxygen sensor for all available engines in a 1991 Ford Ranger