Go Back   F150online Forums > Powertrain & Mechanical > Chips, Tuners & Programming
Sign in using an external account
Register Forgot Password?
Register Photos Vin Decoder FAQ Members Search Today's Posts Mark Forums Read VendorsGarage

Chips, Tuners & Programming SPONSORED BY:




Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-16-2010, 01:35 PM
Member
Garage is empty, add now
 
Join Date: Jan 2010
Posts: 11
Clearing codes for emissions testing?

I have a 97 expedition 5.4l and i am having the trouble code po401, but i have read that model yrs 96-2001 can have up to 2 system not ready codes and still pass emissions, so im wondering if i was to get a scanner to clear this code, would only one system not ready code show up on emissions and i would be able to pass, i live in ga, and im not even sure if thats the case but thats what ive read. If that is possible what scanner is best that is readily available at the local auto parts store? I saw advance carries actron and one that is capable of clearing codes is like $180, is that a decent one for the price or can i get one just as good for less dinero? Thanks in advance.
Reply With Quote
  #2  
Old 01-16-2010, 02:00 PM
glc glc is offline
Senior Member
Garage is empty, add now
 
Join Date: Dec 2006
Location: Joplin MO
Vehicle: 2003 Ford F150
Posts: 27,788
Why don't you just fix the problem? P0401 is common, you have an EGR issue, most likely a new DPFE will fix it.
__________________
2003 F-150 XL RCSB 2wd 4.2 M5OD 3.55 LS
Reply With Quote
  #3  
Old 01-16-2010, 02:57 PM
Member
Garage is empty, add now
 
Join Date: Jan 2010
Posts: 11
Well i already took off the egr valve and cleaned it and also took off the throttle body/upper intake and cleaned out the port holes to the egr valve and i drove 10 miles and check engine light came on but i'm thinking it could be a different code and just wanted to know about clearing codes and a good scanner to purchase. Does anyone have any suggestions about a good scanner from autozone or oreilys, or if clearing one code so only one system says not ready if it will pass emissions?
Reply With Quote
  #4  
Old 01-16-2010, 04:10 PM
glc glc is offline
Senior Member
Garage is empty, add now
 
Join Date: Dec 2006
Location: Joplin MO
Vehicle: 2003 Ford F150
Posts: 27,788
As I said, the most common cause of a P0401 is a bad DPFE (or cracked vacuum lines going to it), *NOT* the EGR valve itself.........
__________________
2003 F-150 XL RCSB 2wd 4.2 M5OD 3.55 LS
Reply With Quote
  #5  
Old 01-16-2010, 06:09 PM
Global Moderator &
Senior Member
2005 Ford F-150
 
Join Date: Aug 2007
Location: Among javelinas and scorpions in Zoniestan
Vehicle: 2005 Ford F150
Posts: 5,591
Pay attention to what glc is telling you, jdunwidd. He's trying to save you some money and get you past the emissions check too! Even if you WERE able to clear the code, it would probably come right back if the underlying problem is not repaired.

- Jack
__________________

2005 KR 4x4 SCrew 5.4, "Gott's" style CAI, PHP Gryphon CTS Tuned
Reply With Quote
  #6  
Old 01-16-2010, 06:18 PM
Member
1997 Ford F-150
 
Join Date: Jan 2010
Location: Delaware
Vehicle: 1997 Ford F-150
Posts: 35
Trying to cheat the system is VERY tricky. When you clear codes, you computer resets a count that says the vehicle has been driven X miles since the last code clearning. You have to go at leat 5-10 miles before your computer resets itself, which is why the code will come back after you clear it- because it's reset and reading properly. The DMV knows if you cleared the code right before you go there, your computer will rat you out! ^_^
Reply With Quote
  #7  
Old 01-16-2010, 06:32 PM
Senior Member
1998 Ford F-150
 
Join Date: Jun 2005
Location: NEVADA
Vehicle: 1998 FORD F 150
Posts: 2,803
.......i have read that model yrs 96-2001 can have up to 2 system not ready codes and still pass emissions....

I believe this is correct, as I have seen at least one system not ready on my own emission report.
As your mechanical issue has been diagnosed and is easily repaired why not fix it anyway?
__________________
Reply With Quote
  #8  
Old 01-16-2010, 07:32 PM
glc glc is offline
Senior Member
Garage is empty, add now
 
Join Date: Dec 2006
Location: Joplin MO
Vehicle: 2003 Ford F150
Posts: 27,788
It depends on the state. In IL, you cannot have *ANY* stored codes, and the P1000 must be gone.
__________________
2003 F-150 XL RCSB 2wd 4.2 M5OD 3.55 LS
Reply With Quote
  #9  
Old 01-17-2010, 02:48 PM
Member
Garage is empty, add now
 
Join Date: Jan 2010
Posts: 11
I am stumped, I have cleaned everything, egr suck test performed caused stalled engine so its operating correctly, replaced dpfe sensor, Mil lamp on again, I read you can check the vacuum wiring harness with a mighty vac, how exactly is this performed, going to find out whether i can pass emissions with one system not ready as when i use scanner after clearing po401 it says only egr system check incomplete, anyone know where these regulations are found for Ga?
Reply With Quote
  #10  
Old 01-17-2010, 02:57 PM
Member
Garage is empty, add now
 
Join Date: Jan 2010
Posts: 11
I found this on the cleanairforce.com website http://www.cleanairforce.com/docs/readiness.pdf, stating "If enough monitors have not completed the check of the emission
control system by the time a motorist presents a vehicle for inspection, the vehicle’s on-board diagnostic (OBD) computer will
not be “Ready” and will fail the inspection. For example, 1996 to 2000 model year vehicles will fail if three or more monitors are
“Not Ready” while 2001 and newer model year vehicles will fail if two or more monitors are “Not Ready.”

Thought I would mention this just in case your from Ga and having problems like me.

So now I'm guessing if just the egr system says incomplete after checking with scanner, then I can still pass emissions.
Reply With Quote
  #11  
Old 01-17-2010, 04:40 PM
glc glc is offline
Senior Member
Garage is empty, add now
 
Join Date: Dec 2006
Location: Joplin MO
Vehicle: 2003 Ford F150
Posts: 27,788
Only problem with that is - what happens if the EGR system DOES complete the readiness testing and the fault DOES trip the CEL before your inspection is complete? That's a fail.
__________________
2003 F-150 XL RCSB 2wd 4.2 M5OD 3.55 LS
Reply With Quote
  #12  
Old 01-17-2010, 04:47 PM
Member
Garage is empty, add now
 
Join Date: Jan 2010
Posts: 11
Right, After clearing the code multiple times, it would take between 15-20 mi. for the mil to light up, but luckily the emissions is 2 mi down the road, but i realized after clearing the code i went and looked at the monitors and it also cleared 2 for the oxygen sensors, one for the evap., and one for the egr, so thats 4 incomplete systems and wouldn't pass, now im back to trying to test the vac lines with a mighty vac, and checking the evm voltage, can anyone explain the procedure for doing those. Thanks for everyone's replies, it's greatly appreciated.
Reply With Quote
  #13  
Old 01-17-2010, 10:13 PM
glc glc is offline
Senior Member
Garage is empty, add now
 
Join Date: Dec 2006
Location: Joplin MO
Vehicle: 2003 Ford F150
Posts: 27,788
Could you please post all the exact codes by number?
__________________
2003 F-150 XL RCSB 2wd 4.2 M5OD 3.55 LS
Reply With Quote
  #14  
Old 01-17-2010, 11:02 PM
Global Moderator &
Senior Member
2005 Ford F-150
 
Join Date: Aug 2007
Location: Among javelinas and scorpions in Zoniestan
Vehicle: 2005 Ford F150
Posts: 5,591
It IS getting a bit difficult to follow, isn't it?

- Jack
Reply With Quote
  #15  
Old 01-18-2010, 05:01 PM
Member
Garage is empty, add now
 
Join Date: Jan 2010
Posts: 11
it is only one code p0401, i was saying if you clear this code with a scanner it resets 4 obd2 systems as mentioned above, I am still stuck on this code and im not sure how to move forward, i have taken off the throttle body/elbow and cleaned the ports, replaced evm solenoid, replaced the dpfe sensor, checked and made sure the egr valve was working by applying vac and it stalled the engine so that is working, now i assume i need to check the vac lines with a vac tool but im not sure where to begin. when i replaced the evm solenoid i was curious to see that the green vac line on top didn't totally butt up to the solenoid but was off by maybe a cm or to, i think i am going to check that connection but i don't specifically know how to vac test the line, can anyone help me, i appreciate your reply in advance, I am frustrated and confused at this point.
Reply With Quote
Old 01-18-2010, 05:01 PM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -4. The time now is 02:50 PM.


 
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details

Search Engine Friendly URLs by vBSEO 3.5.2