Speed sensor codes return after replacing the sensor. are their more sensors

It's called bank, not base. On a v6 or v8, each side of the engine is called a bank. Bank 1 is always the side where the number 1 cylinder is located. On Fords, number 1 is on the right bank or side, the right as if you were sitting in the vehicle, so well, the passenger side.
Sensor 2 is the oxygen sensor in the exhaust stream after the catalytic converter (somebody recently called it the cadillac converter!). You have two oxygen sensors on the right bank, one before the cat and sensor 2 is after the cat. The only purpose of sensor 2 is so the computer can monitor the efficiency of the catalytic converter. It compares the readings from sensor 1 and sensor 2. Sensor 1 information is how the computer adjusts fuel trim.

https://www.google.ca/search?q=1996+ford+explorer+speed+sensor+photo&ie=utf-8&oe=utf-8&aq=t&rls=com.yahoo:en-US:official&client=firefox

If the front oxygen sensors have over 100,000 miles
on them change & then work on vacuum leaks in exhaust
prior to converter & then ignition misfires

Spark Plugs--every 3 years
Clean MAF Sensor

Exhaust Converter may be shot,then only last 12 to 14 years
If so-- then do the rear sensors as well

Sounds like a "WSS" (wheel speed sensor) problem. Each wheel has one. Located on the backside of each hub, between the brake disc and hub bearing. Check for loose connector first. Wire damage? Wiring touching exhaust pipes or rubbing wheel or tire? Look for mud or debris or damage to the sensor's or the rotating sensor ring. ( has a lot of "teeth") Try driving in reverse, in a straight line 25 to 30 feet, then drive forward twice that distance. If that does not clear the warning lamps most auto parts stores can hook into your computer (usually for free) and determine which sensor(s) have an issue. Replacing these sensors is common and simple. You may still need to get the code cleared to turn light off.

stop by local parts store (Autozone,Advance, etc) and have them do a free fault code test. They can print out a list of faults and clear the codes

There is a problem with these electronic speedometers, but 1st have the fault codes read and see if the speed sensor has set a code, if it does have a code for the speed senor replace it, if there is no code for the sensor the speedometer is defective and needs to be removed and send out to a Ford electronics repair center.

Hi, bank 1 will be the passanger side, same side as no. 1 cylinder. No. 1 sensor will the the front sensor before the cats. I always replace both sensors when i get a code for one switching slow if you don't your new one will switch faster then your old one and will set a code and light for the old sensor switching slow.
Take care

If you mean the gear in the speedo head .You have to disassemble the cluster. Google odometer gears and order a new one. It's a lot cheaper than a cluster.

The ABS light is for the Anti-lock Braking System. The MIL will illuminate if there is a difference in wheel speed sensors signals to the PCM. So you might have a wheel speed sensor that is going out on you. Does the light come on at low speeds, or just higway speeds? You could take the vehicle to a local parts store and have them pull the codes for you and that will tell you which speed sensor is out of whack. Also road grime, dirt and gunk buildup can cause speed sensors to give false readings. Hope tihs helps you out.......

it may be a defective O2 sensor here is th difinition:
P0133 - Heated Oxygen Sensor (HO2S) Slow Response Bank 1 Sensor 1 , this is the sensor on the side of the engine that #1 cylinder is on, it is the sensor before the cat.