1998 f150 reset drive cycle

Drive cycles are the amount of time vehicle has been driven since clear--battery disconnected--Drive vehicle for 1 hour under road conditions--then retest.

YOUR EMS MUST RE LEARN. THIS WILL TAKE 3 TO 5 COLD STARTS AND SOME CITY AND HWY DRIVING

"drive it around more" is the solution. This allows the ECU to "learn" and store the operating conditions for emissions. 100km/ 60 miles is usually enough.

Hello,

Assuming the problems have been fixed it can take a few minutes to a few days depending on the drive time. The computer will eventually relearn everything. The PCM will adapt to your driving habits. It can take a while sometimes. Give it a week or so.
Regards, Tony

If you are asking about how long before the code would come up again after resetting, it is 2 drive cycles.
Until that time, the DTC P1000 is set ( tests not completed ).

Here is the write up on Ford drive cycles
http://www.obdii.com/drivecycleford.html

IT IS NOT A CERTAIN NUMBER OF MILES
READ THE TEST DISCRIPTION AT THE WEB LINK BELOW, FOLLOW IT TO THE "T"
http://www.obdii.com/drivecycleford.html

a drive cycle is not measured in miles driven but in the type of driving done, here is a ford drive cycle procedure to clear the not ready code.

Ford Motor Company Driving Cycle Description of OBDII Drive Cycle
The following procedure is designed to execute and complete the OBDII monitors and to clear the Ford P1000, I/M readiness code. To complete a specific monitor for repair verification, follow steps 1 through 4, then continue with the step described by the appropriate monitor found under the "OBDII Monitor Exercised" column. When the ambient air temperature is outside 4.4 to 37.8°C (40 to 100° F), or the altitude is above 2438 meters (8000 feet), the EVAP monitor will not run. If the P1000 code must be cleared in these conditions, the PCM must detect them once (twice on some applications) before the EVAP monitor can be "bypassed" and the P1000 cleared. The Evap "bypassing" procedure is described in the following drive cycle.
The OBDII Drive Cycle will be performed using a scan tool. Consult the instruction manual for each described function. NOTE: A detailed description of a Powertrain Control Module (PCM) Reset is found in this section, refer to the table of contents.
Drive Cycle Recommendations:

1. Most OBDII monitors will complete more readily using a "steady foot" driving style during cruise or acceleration modes. Operating the throttle in a "smooth" fashion will minimize the time required for monitor completion.
2. Fuel tank level should be between 1/2 and 3/4 fill with 3/4 fill being the most desirable.
3. The Evaporative Monitor can only operate during the first 30 minutes of engine operation. When executing the procedure for this monitor, stay in part throttle mode and drive in a smooth fashion to minimize "fuel slosh".

WARNING
STRICT OBSERVANCE OF POSTED SPEED LIMITS AND ATTENTION TO DRIVING CONDITIONS ARE MANDATORY WHEN PROCEEDING THROUGH THE FOLLOWING DRIVE CYCLES.
For best results, follow each of the following steps as accurately as possible:

This is the biggest flaw in emissions testing. It takes 4 tanks of fuel and 1000 miles of wasteful driving to reset the computer on the FORD TAURUS (I've got a 2000). So much for pollution control!

You don't reset them you replace them.
Thanks,
Lee

you can get it online or go too auto zone and look it up in the manual