89 5.0 has 2, o2 sensors.
There are four.
According to fordparts.com the 1989 Ford Mustang GT has ( 1 ) oxygen sensor
That engine has 2 of them.
Two
There are two.
any car after 1995 has two, or four oxygen sensors,as they use OBDII system
there are 2 pre and two after
There is one and it is before the catalytic converter.
There are two oxygen sensors in a 2003 Sonoma V6 with a 4.3 liter. Prices for the sensors start at $69.95.
The 5.0 liter V8 has ( 4 ) oxygen sensors The 4.0 liter EFI ( which is an over head valve / pushrod design ) has ( 3 ) oxygen sensors Note: The 2 upstream oxygen sensors are used for adjusting the air / fuel ratio of the engine , the other oxygen sensor (s) are called catalyst monitors and monitor the performance of the catalytic converter(s)
This model accord has two oxygen sensors, when in the front in the motor and one under the passenger seat and both can be pretty costly about 100 apiece..
4 ======================================================= The above answer is correct if you have the 5.0 liter V8 engine in your 1996 Ford Explorer , but if you have the 4.0 liter EFI , V6 engine ( VIN " X " ) there are ( 3 oxygen sensors )