1997 Ford F-150 Monitors Failed to Initiate

DRAJEL

MEMBER
1997 FORD F-150
4.6L
V8
4WD
AUTOMATIC
186,000 MILES

I ran an OBDII test to see if my truck was throwing any codes and I had several monitors fail to report. The following monitors were reported as "not ready:"

Catalyst Monitor
O2 Sensor Monitor
O2 Sensor Heater Monitor
EGR System Monitor
EVAP System Monitor

I know that the Catalyst and EVAP could be just meeting the requirements for the test to start, I was just worried about all of these coming up at once. Any help would be greatly appreciated.

2 Replies

HMAC300

MECHANIC
48,601 POSTS

Check battery for clean terminal ends and condition including load test, most places do for free.

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Tuesday, February 10th, 2015 AT 6:14 AM

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

Hmm, monitors, each manufacturer has a specific method for setting the monitors, but what I have found is that heat and cold cysliens help, also drive it about 50 miles and the monitors should reset. I found this information as well.

Ford F-150 Drive Cycle
Start the Engine: Start the vehicle and let it idle in park for 5-10 minutes.
Accelerate: Accelerate to 55 mph at half throttle. Keep the vehicle at a steady 55 mph for 3 minutes.

Decelerate: Release the throttle and coast down to 20 mph without using the brakes.
Accelerate Again: Accelerate again to 55-60 mph at half throttle and maintain this speed for 5 minutes.

Decelerate and Idle: Decelerate to a stop, allowing the vehicle to coast down without braking, then let the engine idle for 1-2 minutes.

Stop and Go: Perform 3 stops from 25 mph. Accelerate to 25 mph, then decelerate to a stop without using the brakes, and then idle for 30 seconds.

Let us know how it goes