I just bought a 2010 Crew cab, lariat, 5.4L, 80k miles. I got a check engine light the second time that I drove it. Came up as P0446 I think. Cleared the code a few times and it kept coming back. Looked under and was lucky enough to see a bad wire. I cut out the bad part, put in a butt splice, cleared the code and all is good, except.....

I need emissions (northern VA) and I can't get the EVAP ready. I have driven about 450 miles, highway and suburbs. Every time I scan, the EVAP says incomplete. I have a feeling I could drive a thousand miles and it wouldn't change. This morning I did between 45mph and 65mph for over 10 miles because I read that would do it, but it didn't.

Any help would be greatly appreciated.

 

Is it possible the truck had a tune on it? i know 5 Star tunes shut off certain OBD "systems" I had the issue that 3 of my systems weren't in readiness status and i failed inspection till i either put the truck back to stock or installed the new inspection friendly tunes from 5 Star

 

I'm not sure. I honestly would not even know how to check. Is there somewhere to look to see if something was modified?

Thank you for the help

 

Could you ask the person who you bought it from? otherwise I'm not sure how to tell other then going to a dealership

 

Could be the battery was just replaced and you need to complete a drive cycle.

- from another poster about Ford's drive cycle...

Getting the EVAP monitor to run can be tricky. Here's the drive cycle info I found:

For the EVAP/secondary AIR monitor to run:

• The ambient air temperature must be between 50 to 100°F (10 to 37°C)
• The altitude below 8,000 feet (2,438meters)

Most OBD monitors complete more readily using a steady foot driving style during cruise or acceleration modes. Operating the throttle in a smooth fashion minimizes the time required for monitor completion.

• The fuel tank level should be between 1/2 and 3/4 full with 3/4 full being the most desirable.
• The evaporative monitor can operate only during the first

Procedure:
1. Start the engine cold (having sat for >8 hours).
2. Idle the vehicle for 15 seconds and then drive at 40 mph (64 km/h) until the engine coolant temperature (ECT) is at least 170°F (76.7°C).
3. Make sure that the intake air temperature (IAT) between 50 to 100°F (10 to 37°C).

NOTE: To initiate the next monitor step, the throttle should be at part throttle, EVAPDC must be greater then 75%, and fuel level must be between 15 and 85%, and for fuel tanks over 25 gallons fuel level must be between 30 and 85%.

4. Cruise at 45 to 55 mph (72 to 89 km/h) for 10 minutes (avoid sharp turns and hills).
5. Drive in stop and go traffic conditions. Include 5 different constant cruise speeds, ranging from 25 to 55 mph (33 to 89 km/h) over a 10 minute period.
6. Bring the vehicle to a stop. Idle with the transmission in drive (neutral for M/T) for 2 minutes.
7. For the EVAP Monitor Bypass, park the vehicle for a minimum of 8 hours and repeat the generic procedure.
8. With the scan tool, view the monitor for completion. Repeat this procedure if necessary.

P.S. If the EVAP is the only monitor that hasn't passed yet, some states still let you pass testing.